Established tcp connection of question

Now we have two Master LDAP server, A and B. Both of them have Replication function on.
I have encountered a problem. There are always a lot of Established tcp connection between them. Once they established this kind of tcp connection, it will never be closed and keep on increasing the connection number. This will lead LDAP A daemon become a zombie daemon so that it cannot supply the LDAP service. At this time, server A usually has a very high load. After rebooting server B, we use the following command to test server A. It turns out that the connection between this two server is still established and never be closed.
Restart Sever A ldap daemon can temporarily solve this problem. But it will repeat the above situation about one week later.
We feel very frustrated about this problem. My question is how to close this kind of tcp connection or do you have any resolution about our problem.
Thank you.
bash-2.05# netstat -an|grep 192.168.1.92
192.168.1.91.389 192.168.1.92.61206 49680 0 49680 0 ESTABLISHED
192.168.1.91.389 192.168.1.92.61207 49680 0 49680 0 ESTABLISHED
192.168.1.91.389 192.168.1.92.61212 49680 0 49680 0 ESTABLISHED
bash-2.05# netstat -an|grep 192.168.1.92|wc -l
1667

You may want to send this info directly to Apple at http://www.apple.com/feedback/iphone.html as in here, we are just users so really cannot offer any help to how the iPhone is coded to work.

Similar Messages

Wired port cannot establish TCP connections

I have come across an error that I have so far been unable to solve via google/searching forums.
From time to time, the wired port loses the capability to establish TCP connections. I can ping fine, I can resolve names fine indicating that at least UDP 53 is working. It's impossible to complete a three way handshake for any TCP connection, be it SSH, HTTP, FTP or anything else. This happens randomly after a network connection has been working fine for days. The Internet Connection Wizard claims everything is peachy as it probably just performs a ping to some site.
A reboot does not fix the problem - what does fix it is unplugging the cable, changing to wireless and associating with a network, opening a connection, then shutting down AirPort again and plugging the cable back in. Just replugging without establishing a TCP connection via AirPort does not work.
Is there anything I am missing here? Should I be contacting an Apple Store to talk about repairs/replacements?
Thanks for your time and consideration, if there's any other information needed to make light of the problem, I will post it as soon as I see the request. Unfortunately, I cannot produce the problem at will and have so far neglected running a traffic sniffer to look at exactly what is happening on a packet level - tho "telnet server 80" times out when "ping server" works fine.

Well, I have gotten the FMS on Windows to work via my basic client app (via localhost in the NetConnection call). Taking the same SWF and specifying the external IP of the Windows machine doesnt work.
So I am kind of back to square one.
I made sure that the default Adaptor is bound to any IP (using ":1935,80" in the default Adaptor.xml HostPort tag). So FMS should be bound to all network interfaces.
Just to clarify: FMS is running in "development" mode. Does that mode prevent external connections?

Unable to establish TCP connection when enabling internet sharing (Phone acting as hotspot)

I have developed a small .NET Desktop application which hosts a TCP service. In addition, it sends UDP Multicasts to anounce that service.
Service consumer is a Phone 8.1 app, which listens for these UDP multicasts and when it receives such a multicast, it creates a TCP connection to the service.
The following snippet shows how the Phone 8.1 app listens for UDP packets and then connects via TCP
const string UdpPort = "42";
const string TcpPort = "43";
const string MultiCastIp = "224.5.6.7";
const int TimeoutForServerLookup = 10000;
//-- listen for UDP multicasts
HostName hostNameOfServer = null;
var udp = new DatagramSocket();
var clientFound = false;
udp.MessageReceived += delegate(DatagramSocket sender, DatagramSocketMessageReceivedEventArgs args)
try
hostNameOfServer = args.RemoteAddress;
catch (Exception ex)
s_Log.Error("Error in handling UDP packet", ex);
await udp.BindServiceNameAsync(UdpPort);
udp.JoinMulticastGroup(new HostName(MultiCastIp));
var waitedTimeInMs = 0;
const int delayInMs = 250;
while (waitedTimeInMs < TimeoutForServerLookup && hostNameOfServer == null)
waitedTimeInMs += delayInMs;
await Task.Delay(TimeSpan.FromMilliseconds(delayInMs));
udp.Dispose();
//-- we now have the adress of the TCP server (hostNameOfServer)
//-- connect now to the server. this works when being in a "normal" WLAN, does not work when the phone is the hotspot
var socket = new StreamSocket();
await socket.ConnectAsync(hostNameOfServer, TcpPort);
This works well when the Desktop computer and the Windows Phone 8.1 are within the same WLAN. For some customers it is important that this also works when the Windows Phone 8.1 acts as hotspot (by enabling internet sharing on the phone) and the desktop computer
(or Laptop) connects itself to this WLAN. In this scenario the Phone 8.1 still receives the UDP packets, but when trying to connect via TCP, the connection attempt fails.
Any ideas how to get rid of this problem?

Have you tracked down if the phone actually sends the TCP connection to the desktop? I'm feeling that this is a firewall issue that shows itself when the firewall zone changes (public/private/domain).
Matt Small - Microsoft Escalation Engineer - Forum Moderator
If my reply answers your question, please mark this post as answered.
NOTE: If I ask for code, please provide something that I can drop directly into a project and run (including XAML), or an actual application project. I'm trying to help a lot of people, so I don't have time to figure out weird snippets with undefined
objects and unknown namespaces.

Establish TCP connection in SIT framework

I am using LabVIEW 8.6 with Simulation Interface Toolkit (SIT) running a model on PXI. I need to establish communications between host and driver that are unrelated to the Model. I am having issues establishing a TCP connection. I have tried 3 different port addresses (6342, 7342 and 55555), carefully avoiding 6011. IP address (on driver side) is the address for the host PC. I used TCP Communicator - Active.vi and TCP Communicator - Passive.vi as examples. The Host vi (Passive side) hangs at TCP Listen, waiting for connection. If I run the Driver vi along with "TCP Communicator - Passive.vi", communications are established. Is there something SIT is doing on the host side that is preventing this communication?

Hi DinaDemara,
You should be able to use SIT and communicate via TCP.
1. Make sure that you are performing your TCP functionality outside of the control loop in SIT. Preferably, implement your TCP functionality in a separate VI outside of the SIT control loop.
2. I highly recommend for you to use the two NI Example Finder VIs called Simple Data Client.vi and Simple Data Server.vi to test your network. After you get these two VIs to communicate successfully, adapt them to your application.
3. Turn off all firewalls to test.
Let me know if you are still having problems.
Aldo A
Applications Engineer
National Instruments

Error: The Network Adapter could not establish the connection

hi, i am using classes111.zip (the oracle 8.0.5 thin driver) with
linux and gnu jsp pages. the backend is an oracle 8.04 NT
database.
i get this error: "The Network Adapter could not establish the
connection " my question is this - is this error the client
problem or the db server problem. here is the code:
String driverName = "oracle.jdbc.OracleDriver";
String url = "jdbc:oracle:thin:oracle1:1541:ORCL";
String user = "demo";
String pwd = "demo";
String SQL = "";
ResultSet rs;
try
DriverManager.registerDriver(new
oracle.jdbc.driver.OracleDriver());
Connection con = DriverManager.getConnection(url,
user, pwd );
DatabaseMetaData dma = con.getMetaData();
Statement stmt = con.createStatement();
rs = stmt.executeQuery("select * from test");
while(rs.next())
out.println(rs.getString("xx") +
rs.getString("yy"));
catch( SQLException e )
out.println("
error: -> " + e + " <-
exiting
any ideas?
thanks in advance,
steve
null

hi, i am using classes111.zip (the oracle 8.0.5 thin driver) with
linux and gnu jsp pages. the backend is an oracle 8.04 NT
database.
i get this error: "The Network Adapter could not establish the
connection " my question is this - is this error the client
problem or the db server problem. here is the code:
String driverName = "oracle.jdbc.OracleDriver";
String url = "jdbc:oracle:thin:oracle1:1541:ORCL";
String user = "demo";
String pwd = "demo";
String SQL = "";
ResultSet rs;
try
DriverManager.registerDriver(new
oracle.jdbc.driver.OracleDriver());
Connection con = DriverManager.getConnection(url,
user, pwd );
DatabaseMetaData dma = con.getMetaData();
Statement stmt = con.createStatement();
rs = stmt.executeQuery("select * from test");
while(rs.next())
out.println(rs.getString("xx") +
rs.getString("yy"));
catch( SQLException e )
out.println("
error: -> " + e + " <-
exiting
any ideas?
thanks in advance,
steve
null

How to send joystick data over TCP connection

Hi all,
I am a long time Labview discussion forum user for learning, but this is my first time posting a question, I hope somebody can help me!
In the attached VI I am trying to send data from a joystick over a TCP connection. I can send data fine using the TCP examples (in fact the majority of my VI is just a copy of the example). However I am to the point where I do not know how to send all the data necessary (3 axis data, 12 buttons, and the POV data) over TCP. Strings, clusters, and arrays were never my strong suite and converting between them is a nightmare for me.
Basically I am trying to send each axis data (X,Y, and Z), button data (12 buttons), and POV data (the POV data will be calculated to adjust the position of a camera, so the immediate data is not important, I will add functions to add the change in the button movements to write a standing position for two servos [pan and tilt], for which that I will need to send over the TCP connection) over the TCP connection to control various cameras and motors. I don't know if it is posible to send that much data over a TCP connection in one write VI through a string, and also how to separate the string on the other side in order to control the client VI.
Again, the actual TCP communication I get, and can operate fine, just formatting all the data into a string (or whatever is required) so that I can unpack on the other side is the issue here.
Another question I have (not impotant to get the program running just might make it easier on me) is can a TCP server (which sends the data to the client) also recieve data back from the client on the same port ( for example sensor data and digital positions [on,off])? Or do I need to set up two TCP communication loops with the first client acting as the server on a different port than the first, which then sends the data to the original server, which also has a client TCP configuration in another loop? I hope this makes sense...
One final question.....I already have a solution to this but using labview for the entirety of this project would be nice. I use skype to stream 1080p video from a webcam to my computer so I can view live feed. Can labview do this? This would be awesome if so, I am just not sure if the communication protocols in use could support real time (or as close as possible to streaming) for 1080p video.
Thanks all in advance for your help,
Physicsnole
Attachments:
cameraserver.vi ‏24 KB
cameraclient.vi ‏18 KB

Physicsnole wrote:
In the attached VI I am trying to send data from a joystick over a TCP connection. I can send data fine using the TCP examples (in fact the majority of my VI is just a copy of the example). However I am to the point where I do not know how to send all the data necessary (3 axis data, 12 buttons, and the POV data) over TCP. Strings, clusters, and arrays were never my strong suite and converting between them is a nightmare for me.
Well, you cast the axis info cluster to a string, but then you cast it back to an array of DBL. Thatr's not compatible. You should probably cast it back to an "axis info" cluster of exactly the same type. Go the the other VI and right-click the cluster wire to create a constant. Now move that diagram cluster constant to the other VI and use it as type.
Your default ports don't seem to match. You seem to have client and server roles confused. In the sever you create a listener, but then you start sending packets, even though no connection is established. The connection needs to be initiated by the client.
Your client stops the loop the first time a timeout is encountered. Shouldn't that be more permanent? Also, please retain code clarity and avoid unecessary complexities. For example, replace the "not or" with a plain "or" and change the loop to "stop if true"
Physicsnole wrote:
Basically I am trying to send each axis data (X,Y, and Z), button data (12 buttons), and POV data (the POV data will be calculated to adjust the position of a camera, so the immediate data is not important, I will add functions to add the change in the button movements to write a standing position for two servos [pan and tilt], for which that I will need to send over the TCP connection) over the TCP connection to control various cameras and motors. I don't know if it is posible to send that much data over a TCP connection in one write VI through a string, and also how to separate the string on the other side in order to control the client VI.
You can send as much as you want. The casting to/from string is the same as described above.
Physicsnole wrote:
Another question I have (not impotant to get the program running just might make it easier on me) is can a TCP server (which sends the data to the client) also recieve data back from the client on the same port ( for example sensor data and digital positions [on,off])? Or do I need to set up two TCP communication loops with the first client acting as the server on a different port than the first, which then sends the data to the original server, which also has a client TCP configuration in another loop? I hope this makes sense..
The primary function of a "server" is to wait for a connection and then communicate with the client once a conenction is established. An established TCP/IP connection is fully two-way and both sides can send and receive.
LabVIEW Champion . Do more with less code and in less time .

Jdbc. The Network Adapter could not establish the connection. Help Please!!

I've found several responses over this issue, but none works for me.
I'm trying to setup a simple jdbc connection from a simple program.
Platform:
Fedora Core 4 (FC4) on AMD 64 bits
Java 1.4.2_04 (64 bits)
ORacle 10g or Oracle 9.2.0.4 (none works);
Tips:
- I can't connect to a remote server, nor to a local server
- I can connect using SQLplus
- TNSPing works fine
- Listener it's up
- my connection string is jdbc:oracle:thin:user/name@host:port:sid
- Also try jdbc:oracle:thin:user/name@//host:port/sid
- I'v tryied with classes12.jar, odbj14.jar
- my hostname it's ok.
I've monitored ip traffic on remote computer. While using TNSPING I detect activity. While using jdbc, no.
Please, any idea??

Thanks for your reply.
To your questions:
- I´v tried both IP, host, and even host.domain
- I can connect from remote workstation using toad, and from local using sqlplus.
- I can´t connect via jdbc.
Folowing:
A) my sample code
B) the stack trace
C) the listener status (from my 9i server. Also tryied another servr with 10g)
when I call this program, I´ve tried severl connection strings:
jdbc:oracle:thin:user/pass@sdd51:1521:ebf
jdbc:oracle:thin:user/pass@:sdd51.sdd.com.ar:1521:ebf
jdbc:oracle:thin:user/pass@:10.10.10.51:1521:ebf
also try the other sintax:
jdbc:oracle:thin:user/pass@//sdd51:1521/ebf
In the classpath, I´tryied:
clasess12.jar
ojdbc14.jar
nls_charset12.jar
thanks
A)=================================================
// Import the JDBC classes
import java.sql.*;
import oracle.jdbc.pool.OracleDataSource;
import java.io.*;
import java.util.*;
public class test
// The query we will execute
static final String query = "select 'Hello JDBC: ' || sysdate from dual";
// The connection to the database
static Connection conn;
// Create the User Interface
static public void main (String args[])
try {
String connect_string = args[0];
     // See if we need to open the connection to the database
     if (conn == null)
// Create a OracleDataSource instance and set URL
OracleDataSource ods = new OracleDataSource();
ods.setURL(connect_string);
     // Connect to the databse
     System.out.println ("Connecting to " + connect_string + "\n");
     conn = ods.getConnection ();
     System.out.println ("Connected\n");
     // Create a statement
     Statement stmt = conn.createStatement ();
     // Execute the query
     System.out.println ("Executing query " + query + "\n");
     ResultSet rset = stmt.executeQuery (query);
     // Dump the result
     while (rset.next ())
     System.out.println (rset.getString (1) + "\n");
     // We're done
     System.out.println ("done.\n");
catch (Exception e)
e.printStackTrace();
     // Oops
     System.out.println (e.getMessage () + "\n");
B)=================================================
java.sql.SQLException: Io exception: The Network Adapter could not establish the connection
     at oracle.jdbc.dbaccess.DBError.throwSqlException(DBError.java:114)
     at oracle.jdbc.dbaccess.DBError.throwSqlException(DBError.java:156)
     at oracle.jdbc.dbaccess.DBError.throwSqlException(DBError.java:269)
     at oracle.jdbc.driver.OracleConnection.<init>(OracleConnection.java:212)
     at oracle.jdbc.driver.OracleDriver.getConnectionInstance(OracleDriver.java:251)
     at oracle.jdbc.driver.OracleDriver.connect(OracleDriver.java:224)
     at java.sql.DriverManager.getConnection(DriverManager.java:512)
     at java.sql.DriverManager.getConnection(DriverManager.java:171)
     at oracle.jdbc.pool.OracleDataSource.getConnection(OracleDataSource.java:102)
     at oracle.jdbc.pool.OracleDataSource.getConnection(OracleDataSource.java:85)
     at test.main(test.java:66)
C)=================================================
LSNRCTL for Linux: Version 9.2.0.1.0 - Production on 30-JAN-2006 17:39:59
Copyright (c) 1991, 2002, Oracle Corporation. All rights reserved.
Connecting to (ADDRESS=(PROTOCOL=tcp)(PORT=1521))
STATUS of the LISTENER
Alias LISTENER
Version TNSLSNR for Linux: Version 9.2.0.1.0 - Production
Start Date 24-JAN-2006 11:16:18
Uptime 6 days 6 hr. 23 min. 40 sec
Trace Level off
Security OFF
SNMP OFF
Listener Log File /opt/oracle/product/9.2.0/network/log/listener.log
Listening Endpoints Summary...
(DESCRIPTION=(ADDRESS=(PROTOCOL=tcp)(HOST=sdd51.sdd.com.ar)(PORT=1521)))
Services Summary...
Service "ebf" has 1 instance(s).
Instance "ebf", status READY, has 1 handler(s) for this service...
The command completed successfully

Establish a connection through RF modem's on client & server side & to set up PPP communication for data transfer

hi
can any1 over here help me out in how to establish connection between 2 RF modem's for data transfer , between client & server USing LABVIEW?
I want to establish a connection between 2 PC's through RF modem on client & server side & to set up PPP communication for data transfer.
(I have tried data transfer through RS-232 using TCP/IP whn the 2 PC's are connected over ethernet... which is working.
I also tried connecting loopback cable between 2 PC's COM port & geting data transfer using VIsa configure serial port & other visa functions ... which is working)
can u guide me how to establish connection between 2 RF modem's using LABview?
& how does the data transfer take place between 2 RF modems through RS-232?
is it using TCP/IP?
If you got any links to go abt this issue do send me related links .. or any examples .....
I am currently using Labview version 8.
Waiting in anticipation.. reply ASAP..
thanking you
Regards
Yogan..

Howdy yogan,
Maybe you could clarify a few things for me, and we'll see how we can help ya. TCP/IP protocol occurs through an ethernet connection; RS-232 communication occurs through an RS-232 serial connection, typically through a cable that has a DB9 connector on both ends. Do you mean that the RF modems in question have the option to communicate via RS-232 and/or via TCP/IP ethernet? Specific information like the manufacturer of your RF modems, the model number of your RF modems, and how you connect the modems to the PC would enable us to give you more efficient support.
You can check our Instrument Driver Network (IDNet) to see if a plug-and-play/IVI driver already exists for your RF modem. (You'll need to know its manufacturer and model number.) In the case that you do find an IDNet driver for your modem, you can use this KnowledgeBase article for instructions on how to use the driver.
Another excellent resource to consider is the NI Example Finder. You can access this within LabVIEW by navigating to Help»Find Examples and then searching for serial or TCP/IP examples.
Message Edited by pBerg on 03-10-2008 04:35 PM
Warm regards,
pBerg

Problem reading device responses over TCP connection

Hey all,
I have a device that I am sending commands too, and then trying to read back the responses. I just took the TCP Communicator - Active from the NI examples and modified it a little. All the commands I am sending to the device are working (it is responding as expected) but I am only able to read back the response from the first command that I send. Immediatly after it reads back the first response the TCP read outputs an Error 66 (Connection Closed).
My question is this. I want to be able to send multiple commands and have it read back the response from each one, does anyone know why the TCP Read would immediatly return a Connection Closed error after reading the response from the first command? Do I need to re-establish the connection between each command?
It just seems weird that I can send multiple commands to the device (and see the expected results on the device itself, so I know the connection is still good), but can't read back multiple responses. Any help would be appreciated. I have attached the vi I am working with.
Thanks,
Paul
Attachments:
TCP Communicator New.vi ‏38 KB

Sorry, I can't open your VI, but look on this pictures. It should work like a TCP/IP Terminal.
Message Edited by Eugen Graf on 02-19-2008 11:50 AM
LabVIEW Portal
Attachments:
BD2.jpg ‏43 KB
FP.jpg ‏24 KB
BD1.jpg ‏46 KB

Unable to establish loopback connection when running junit tests

Hello,
I just started using jrockit (jrockit-jdk1.6.0_20-R28.1.0-4.0.1) and I encounter a problem running junit tests.
I have 2 tests in the same junit suite, both do binding to 127.0.0.1.
The first test succeeds in the binding. Once it finishes, the second one tries to bind to same address and fails due to IOException, Unable to establish loopback connection (logs below)
If I run them using sun's hotspot jvm they work fine.
If I run them separately, i.e, only one test per suite, each works fine.
It seems that only when switching to jrockit I get the problem.
Any idea?
Thanks,
Edo
Logs:
ERROR [Main Thread_1] Failed to start ConnectionFullVirtualServer[server.traffix.com/127.0.0.1:3868]
[org.jboss.netty.channel.ChannelException: Failed to bind to: server.traffix.com/127.0.0.1:3868 ] thrown
     org.jboss.netty.bootstrap.ServerBootstrap.bind(ServerBootstrap.java:303)
     com.traffix.openblox.core.transport.ConnectionFullVirtualServer.listen(ConnectionFullVirtualServer.java:60)
     com.traffix.openblox.core.transport.VirtualServerTable.listen(VirtualServerTable.java:143)
     com.traffix.openblox.core.transport.StackImpl.doStart(StackImpl.java:772)
     com.traffix.openblox.core.transport.TransportStack.doStart(TransportStack.java:156)
     com.traffix.openblox.core.transport.StackStateMachineImpl.doStart(StackStateMachineImpl.java:75)
     com.traffix.openblox.core.transport.StackStateMachine$StackStateConfigured.processEvent(StackStateMachine.java:60)
     com.traffix.openblox.core.fsm.StateMachine.processEvent(StateMachine.java:90)
Caused by: java.io.IOException: Unable to establish loopback connection
     sun.nio.ch.PipeImpl$Initializer.run(PipeImpl.java:106)
     sun.nio.ch.PipeImpl.<init>(PipeImpl.java:122)
     sun.nio.ch.SelectorProviderImpl.openPipe(SelectorProviderImpl.java:27)
     java.nio.channels.Pipe.open(Pipe.java:133)
     sun.nio.ch.WindowsSelectorImpl.<init>(WindowsSelectorImpl.java:41)
     sun.nio.ch.WindowsSelectorProvider.openSelector(WindowsSelectorProvider.java:26)
     java.nio.channels.Selector.open(Selector.java:209)
     org.jboss.netty.channel.socket.nio.NioServerSocketPipelineSink$Boss.<init>(NioServerSocketPipelineSink.java:219)
Caused by: java.nio.channels.ClosedByInterruptException
     java.nio.channels.spi.AbstractInterruptibleChannel.end(AbstractInterruptibleChannel.java:184)
     sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:518)
     java.nio.channels.SocketChannel.open(SocketChannel.java:146)
     sun.nio.ch.PipeImpl$Initializer.run(PipeImpl.java:78)
     sun.nio.ch.PipeImpl.<init>(PipeImpl.java:122)
     sun.nio.ch.SelectorProviderImpl.openPipe(SelectorProviderImpl.java:27)
     java.nio.channels.Pipe.open(Pipe.java:133)
     sun.nio.ch.WindowsSelectorImpl.<init>(WindowsSelectorImpl.java:41)[ com.traffix.openblox.core.transport.VirtualServerTable.listen(VirtualServerTable.java:146) ][22/12/2010 11:05:57:511]
ERROR [Main Thread_1] Failed to start Endpoint Stack(server.traffix.com Configured)
[org.jboss.netty.channel.ChannelException: Failed to bind to: server.traffix.com/127.0.0.1:3868 ] thrown
     org.jboss.netty.bootstrap.ServerBootstrap.bind(ServerBootstrap.java:303)
     com.traffix.openblox.core.transport.ConnectionFullVirtualServer.listen(ConnectionFullVirtualServer.java:60)
     com.traffix.openblox.core.transport.VirtualServerTable.listen(VirtualServerTable.java:143)
     com.traffix.openblox.core.transport.StackImpl.doStart(StackImpl.java:772)
     com.traffix.openblox.core.transport.TransportStack.doStart(TransportStack.java:156)
     com.traffix.openblox.core.transport.StackStateMachineImpl.doStart(StackStateMachineImpl.java:75)
     com.traffix.openblox.core.transport.StackStateMachine$StackStateConfigured.processEvent(StackStateMachine.java:60)
     com.traffix.openblox.core.fsm.StateMachine.processEvent(StateMachine.java:90)
Caused by: java.io.IOException: Unable to establish loopback connection
     sun.nio.ch.PipeImpl$Initializer.run(PipeImpl.java:106)
     sun.nio.ch.PipeImpl.<init>(PipeImpl.java:122)
     sun.nio.ch.SelectorProviderImpl.openPipe(SelectorProviderImpl.java:27)
     java.nio.channels.Pipe.open(Pipe.java:133)
     sun.nio.ch.WindowsSelectorImpl.<init>(WindowsSelectorImpl.java:41)
     sun.nio.ch.WindowsSelectorProvider.openSelector(WindowsSelectorProvider.java:26)
     java.nio.channels.Selector.open(Selector.java:209)
     org.jboss.netty.channel.socket.nio.NioServerSocketPipelineSink$Boss.<init>(NioServerSocketPipelineSink.java:219)
Caused by: java.nio.channels.ClosedByInterruptException
     java.nio.channels.spi.AbstractInterruptibleChannel.end(AbstractInterruptibleChannel.java:184)
     sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:518)
     java.nio.channels.SocketChannel.open(SocketChannel.java:146)
     sun.nio.ch.PipeImpl$Initializer.run(PipeImpl.java:78)
     sun.nio.ch.PipeImpl.<init>(PipeImpl.java:122)
     sun.nio.ch.SelectorProviderImpl.openPipe(SelectorProviderImpl.java:27)
     java.nio.channels.Pipe.open(Pipe.java:133)
     sun.nio.ch.WindowsSelectorImpl.<init>(WindowsSelectorImpl.java:41

Have you tracked down if the phone actually sends the TCP connection to the desktop? I'm feeling that this is a firewall issue that shows itself when the firewall zone changes (public/private/domain).
Matt Small - Microsoft Escalation Engineer - Forum Moderator
If my reply answers your question, please mark this post as answered.
NOTE: If I ask for code, please provide something that I can drop directly into a project and run (including XAML), or an actual application project. I'm trying to help a lot of people, so I don't have time to figure out weird snippets with undefined
objects and unknown namespaces.

Random TCP connections created in Selector.open (in NIO)

I'm currenlty running a production app which has several independently running application server classes going at any given time. Each of these uses one Selector to provide support for asynchronous I/O operations. Lately I noticed that when bouncing one of these servers I'd have problems bringing it back up because of sequential "ghost listeners" and "ghost connections" colliding with the ports I was interested in.
So, I got out a local port-scanner and did some digging. To my chagrin I discovered that every time I made a call to Selector.open() a new TCP connection was made from my application to my application on an internal port. In Java 1.4.2_02 this occured on the "primary" network adapter. In Java 1.5 this occured on the loopback adapter. Unfortunately for me neither is acceptable because my app regularly binds and unbinds for listening on varying adapters including the wildcard adapter (0.0.0.0) and I can't have my own process colliding with itself trying to listen to ports.
Okay, so then I did some forum searching with the help of a couple co-workers. It turns out these connections are "normal" and related to something called the "wakupPipe", or "wakup pipe". Also, this seems somewhat related to something we call the "runaway select event" in-house (where Selector.select(x) returns 0 before the timeout is up over and over again, which we've long since worked around to support Java 1.4.2_02).
This problem occurs on windows 2000 and windows server 2003. I've attached a code-snippet below that will duplicate the problem (and flood a system with extraneous TCP connections if left running long enough).
My questions are:
1) Why in the world did this wakup pipe have to be implemented as a TCP connection (rather than in-memory)?
2) Why is this not documented anywhere in the Java API's, or am I missing the documentation of it?
3) Is there some way to control the behaviour of this "wakup pipe"? (ie: make it be in-memory only, a file, or specify port-range, IP etc...)
4) Isn't it dangerous to create a library based on undocumented and randomly allocated TCP connections that can't be controlled via configuration?
import java.nio.channels.Selector;
import java.util.ArrayList;
public class NIOSelectorOpenExample implements Runnable {
    protected boolean shouldRun = true;
    public void shutdown() { shouldRun = false; }
    public void run()
      try {
        ArrayList selectors = new ArrayList();
        while( shouldRun )
            selectors.add( Selector.open() );
            Thread.currentThread().sleep(500);
      } catch (Exception ex) {
          ex.printStackTrace();
}Basically on #4 I want to know why/if running this code wouldn't be a major problem on any system that opens and closes ports for listening regularly. (And yes, aside from the fact that it doesn't explicitly clean up the selectors before exiting.)

Hmmm ...
We had an issue in production where one
of the ServerSocketChannels failed to bind because it
collided with the wakeup pipe range. Of course, this
was on Java 1.4.2_02 which binds on the primary
adapter for the system and not the loopback adapter.This seems back to front. By default Java binds to INADDR_ANY which is all the interfaces, which is why you got the collision on the loopback port which was already there. If it bound the socket to a specific non-loopback NIC there would be no collision with any loopback port, they are different number spaces.
Are you able to create all the ServerSockets before any of the Selectors?
or, if your hosts aren't multihomed, is it practical for the application to bind its ServerSockets to the primary NIC (i.e. the non-loopback)?
Yes, we can repeatedly try to bind on a port and
d perform other work-arounds, but why should we have
to? How could we have expected this behavior? (It
may be a Windows limitation that caused Sun to choose
their implementation method, but non-Java TCP apps on
windows don't have these problems...)Agreed, but then again non-Java TCP apps don't try to implement select() for arbitrary numbers of sockets to agree with *nix platforms, they can generally live with <= 64.
Note: The problem appears exacerbated from having the
listen ports of these wakeup pipe connections stay
open for long periods of time (rather than closing as
soon as the pipe is established). Would this help? There would still be the connected port with the same number & this might inhibit a new listening port with that number. Haven't tried this myself.
Well, considering the behavior changed between
1.4.2_02 and 1.5 it can't be all that inaccessible a
fix. Perhaps using an extra TCP connection was
necessary in some cases, but obviously binding to
("127.0.0.1", 0) isn't the only choice since it has
changed recently and those values could easily be
made configurable (given access to the code
involved).It changed from binding to 0, i.e. INADDR_ANY, in 1.4 to binding to 127.0.0.1 in 1.5, probably in an effort to vacate the port space for the physical NICs.
Given access to the code involved you can change anything. In the SCSL code it is sun.nio.ch.WIndowsSelectorImpl.java in src/windows/classes.
Actually, I'm also wondering if a single
(known-default/configurable) listen port wouldn't be
adequate for all of these wakeup pipe TCP
connections. Me too.
Regards
EJP

Quick detection of failed tcp connection

I apologize for asking this question, sense I know variants of it are asked often, but none of the standard solutions I read about seem to apply to my situation.
I have an application acting as a server for a client application written by another organization. Most of our communication is done via UDP, but the client application insists on a TCP connection which usually hangs out unused. I need to be able to detect when this TCP connection goes down. Sense I am only writing the server I can't implement a heartbeat or similar method which requires server and client to work together. Likewise doing a read and waiting for a -1 doesnt work, as the reads seem to time out and fail even when the network is not down due to the client not sending anything to be read across the TCP connection.
So far the best solution I have come up with is to intermittently write a 0 byte when I believe there is a network error (i.e. when our udp communication stops) and capture an exception when this fails. This method does work, but I have to wait for the exception which can take 2-3 minutes from when I kill the network to occur. I would prefer for the exception to occur sooner then that if possible. I've tried setting the SO_TIMOUT bit, but sense write is usually non-blocking this doesnt have any affect. Is there some other method of controlling how long it takes for the tcp socket to fail if it doesnt get an ack back?
I have also thought of other methods of doing this, including always killing the TCP socket the moment UDP fails, or have my serverSocket listen for and accept any reconnect attempts, then killing the old socket once the new one is established. However both methods seem like imperfect workarounds, I would rather be able to use the absence of ACKs to detect that the TCP has stopped working.
And allow me to offer a preemptive thank you for your help.

Is there some other method of controlling how long it takes for the tcp socket to fail if it doesnt get an ack back?The traditional Berkeley socket API offers no way to adjust the timeout.
Some operating systems (perhaps even most major ones) have system-global settings for it - registry, /dev/somemagicname, ndd(1), etc. Google for something like windows adjust tcp timeout or solaris modify tcp retransmission or some such. Be aware that you would be setting a parameter that will affect all programs running on that system. Mostly I would just accept the 2-minute timeout; that's just the way things are.

A network-related or instance-specific error occurred while establishing a connection to SQL Server. The server was not found or was not accessible. Verify that the instance name is correct and that SQL Server is configured to allow remote connections. (p

A network-related or instance-specific error occurred while establishing a connection to SQL Server. The server was not found or was not accessible. Verify that
the instance name is correct and that SQL Server is configured to allow remote connections. (provider: Named Pipes Provider, error: 40 - Could not open a connection to SQL Server)(Microsoft SQL Server, Error: 2)
The system cannot find the file specified
Cannot connect to COWBOYS.
Here are the technical details===================================
A network-related or instance-specific error occurred while establishing a connection to SQL Server. The server was not found or was not accessible. Verify that the instance name is correct and that SQL Server is configured to allow remote connections. (provider:
Named Pipes Provider, error: 40 - Could not open a connection to SQL Server) (.Net SqlClient Data Provider)
For help, click: http://go.microsoft.com/fwlink?ProdName=Microsoft%20SQL%20Server&EvtSrc=MSSQLServer&EvtID=2&LinkId=20476
Error Number: 2
Severity: 20
State: 0
Program Location:
at System.Data.SqlClient.SqlInternalConnection.OnError(SqlException exception, Boolean breakConnection, Action`1 wrapCloseInAction)
at System.Data.SqlClient.TdsParser.ThrowExceptionAndWarning(TdsParserStateObject stateObj, Boolean callerHasConnectionLock, Boolean asyncClose)
at System.Data.SqlClient.TdsParser.Connect(ServerInfo serverInfo, SqlInternalConnectionTds connHandler, Boolean ignoreSniOpenTimeout, Int64 timerExpire, Boolean encrypt, Boolean trustServerCert, Boolean integratedSecurity, Boolean withFailover)
at System.Data.SqlClient.SqlInternalConnectionTds.AttemptOneLogin(ServerInfo serverInfo, String newPassword, SecureString newSecurePassword, Boolean ignoreSniOpenTimeout, TimeoutTimer timeout, Boolean withFailover)
at System.Data.SqlClient.SqlInternalConnectionTds.LoginNoFailover(ServerInfo serverInfo, String newPassword, SecureString newSecurePassword, Boolean redirectedUserInstance, SqlConnectionString connectionOptions, SqlCredential credential, TimeoutTimer
timeout)
at System.Data.SqlClient.SqlInternalConnectionTds.OpenLoginEnlist(TimeoutTimer timeout, SqlConnectionString connectionOptions, SqlCredential credential, String newPassword, SecureString newSecurePassword, Boolean redirectedUserInstance)
at System.Data.SqlClient.SqlInternalConnectionTds..ctor(DbConnectionPoolIdentity identity, SqlConnectionString connectionOptions, SqlCredential credential, Object providerInfo, String newPassword, SecureString newSecurePassword, Boolean redirectedUserInstance,
SqlConnectionString userConnectionOptions, SessionData reconnectSessionData)
at System.Data.SqlClient.SqlConnectionFactory.CreateConnection(DbConnectionOptions options, DbConnectionPoolKey poolKey, Object poolGroupProviderInfo, DbConnectionPool pool, DbConnection owningConnection, DbConnectionOptions userOptions)
at System.Data.ProviderBase.DbConnectionFactory.CreateNonPooledConnection(DbConnection owningConnection, DbConnectionPoolGroup poolGroup, DbConnectionOptions userOptions)
at System.Data.ProviderBase.DbConnectionFactory.TryGetConnection(DbConnection owningConnection, TaskCompletionSource`1 retry, DbConnectionOptions userOptions, DbConnectionInternal oldConnection, DbConnectionInternal& connection)
at System.Data.ProviderBase.DbConnectionInternal.TryOpenConnectionInternal(DbConnection outerConnection, DbConnectionFactory connectionFactory, TaskCompletionSource`1 retry, DbConnectionOptions userOptions)
at System.Data.ProviderBase.DbConnectionClosed.TryOpenConnection(DbConnection outerConnection, DbConnectionFactory connectionFactory, TaskCompletionSource`1 retry, DbConnectionOptions userOptions)
at System.Data.SqlClient.SqlConnection.TryOpenInner(TaskCompletionSource`1 retry)
at System.Data.SqlClient.SqlConnection.TryOpen(TaskCompletionSource`1 retry)
at System.Data.SqlClient.SqlConnection.Open()
at Microsoft.SqlServer.Management.SqlStudio.Explorer.ObjectExplorerService.ValidateConnection(UIConnectionInfo ci, IServerType server)
at Microsoft.SqlServer.Management.UI.ConnectionDlg.Connector.ConnectionThreadUser()
===================================
The system cannot find the file specified
I have tried from so many forms. This is so frustrating. Thank for everyone/anyone who wants to help. So this is what happened: I had to uninstall my previous sqlserver 2012(which worked great) for some reason, and I uninstalled everything from that download.
Then I installed the trial edition of sql server 2012 (64 Bit) and It wouldn't connect to the database. (Error mentioned above.) My local DB is COWBOYS. (COWBOYS is also my computer name.) After this, I have tried downloading sqlexpress and sqlserver 64bit
many times and cannot connect to my local DB.
How do I connect to my Local DB?
Also, I think this might help: (When I run sqlserve.exe, which I was able to find in C:\Program Files\Microsoft SQL Server\110\LocalDB\Binn, I get an error: Your SQL server installation is either corrupt or has been tampered with(Error getting
instance ID from name). Please uninstall then re-run setup to correct this problem.
I would happily re install it, if it wasn't my 20th time.
I don't have any remote connections, I don't use username/password, only window authentication. I work mostly on visual studio, but without able to store /retrieve data, I don't know how to survive.
May be the solution is very simple, but I am too frustrated.
Some of the things I have tried:
From a command prompt, enter one of the following commands:
net start "SQL Server Agent (MSSQLSERVER)" OR
net start "SQL Server Agent(instancename)"(for instance)
on my sql configuration, I cannot start anything because there is nothing there to start. I can post more details, if that would help. Also, some more details about the error:
Details
Product:
SQL Server
ID:
2
Source:
MSSQLServer
Version:
10.0
Component:
SQLEngine
Message:
An error has occurred while establishing a connection to the server. When connecting to SQL Server, this failure may be caused by the fact that under the default settings SQL Server does not allow remote connections. (provider: Named Pipes Provider, error:
40 - Could not open a connection to SQL Server) (.Net SqlClient Data Provider)
Explanation
SQL Server did not respond to the client request because the server is probably not started.
User Action
Make sure that the server is started.
Version:
9.0
Component:
SQLEngine
Message:
An error has occurred while establishing a connection to the server. When connecting to SQL Server 2005, this failure may be caused by the fact that under the default settings SQL Server does not allow remote connections. (provider: Named Pipes Provider, error:
40 - Could not open a connection to SQL Server) (.Net SqlClient Data Provider)
Explanation
SQL Server did not respond to the client request because the server is probably not started.
User Action
Make sure that the server is started.
Any one that can help me, I will be greatful. Thank you so much. p.s. please ask me anything if you have any questions.

It sounds like there are a couple things going on here. First check if you have a successful install of SQL Server, then we'll figure out the connection issues.
Can you launch SQL Server Configuration Manager and check for SQL Server (MSSQLSERVER) if default instance or SQL Server (other name) if you've configured your instance as a named instance. Once you find this, make sure the service is started.
If not started, try to start it and see if it throws an error. If you get an error, post the error message your hitting. If the service starts, you can then launch SSMS and try to connect. If you have a default instance, you can use the machine
name in the connection dialog. Ex: "COWBOYS" where Cowboys is the machine name. However, if you named the SQL Server instance during install, you'll need to connect using the machine\instance format. Ex: COWBOYS\Romo (where Romo
is the instance name you set during install).
You can also look at the summary.txt file in the SQL Server setup error logs to see what happened on the most recent install. Past install history is archived in the log folder if you need to dig those up to help troubleshoot, but the most
recent one may help get to the bottom of it if there is an issue with setup detecting a prior instance that needs to be repaired.
Thanks,
Sam Lester (MSFT)
http://blogs.msdn.com/b/samlester
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ASA 5505:Static Routing and Deny TCP connection because of bad flag

Hi Everybody,
I have a problem. I made a VPN site-2-site with 2 ASA 5505. The VPN works great. And I create a redondant link if the VPN failed.
In fact, I use Dual ISP with route tracking. If the VPN fails, the default route change to an ISDN router, situated on the inside interface.
When I simulated a VPN fail, the ASAs routes switch automatically on backup ISDN routers. If I ping elements, it works great. But when i try TCP connection like telnet, the ASAs deny connections:
%PIX|ASA-6-106015: Deny TCP (no connection) from 172.16.10.57/35066 to 172.16.18.1/23 flags tcp_flags on interface interface_name.
the security appliance discarded a TCP packet that has no associated connection in the security appliance connection table. The security appliance looks for a SYN flag in the packet, which indicates a request to establish a new connection. If the SYN flag is not set, and there is not an existing connection, the security appliance discards the packet.
thanks!
EDIT: On the schema, The interface of the main asa is 172.16.18.148...

Check if the xlate timer is set greater than or equal to what the conn timer, so as not to have connections waiting on xlates that no longer exist. To minimize the number of attempts, enable "service resetinbound" . The PIX will reset the connection and make it go away. Without service resetinbound, the PIX Firewall drops packets that are denied and generates a syslog message stating that the SYN was a denied connection.

"Unable to establish a connection between WebEx and the mail server."

Hi,
I installed Cisco WebEx and integrated with our Microsoft exchange server. It showed server "UP". everything's came up and working fine after that and sudenlly i found this message "Unable to establish a connection with the mail server. Please recheck settings."
I went into the Mail Server setup to edit settings and now, it shows Server Down. Do I need to do something on the MS Exchange 2010 or from webex server ??
Any help is greatly appreciated. Thanks a lot!

Every 180 seconds, CWMS verifies the connection to the SMTP server by establishing a connection on TCP port 25 (SMTP) and then sending the EHLO command followed by the QUIT command. This check is also performed once when logging into the admin web page or when browsing to System -> Servers (where the status of the mail server is displayed).
If this sequence does not complete successfully, the warning “Unable to establish a connection with the mail server. Please recheck settings.” will show in a banner at the top of the CWMS admin pages.
You can verify the connection to the SMTP server manually by using “telnet 25”.
If you have access to the CWMS unix shell be aware that CWMS does not come with the telnet command installed.
As an alternative, you can use this 3-lines script:
exec 3<>/dev/tcp/x.x.x.x/25
echo -e "EHLO\r\nQUIT\r\n " >&3
cat <&3
Replace x.x.x.x by the ip address or hostname of the SMTP server and save the script in a file, f.e.:
/* script saved in a file named ehlo */
[root@dchriste-cwms-adm1 ~]# cat ./ehlo
exec 3<>/dev/tcp/10.48.54.79/25
echo -e "EHLO\r\nQUIT\r\n " >&3
cat <&3
Then, execute it:
[root@dchriste-cwms-adm1 ~]# sh ./ehlo
The output should be similar to this:
220 *******************************************************************************************************************
250-confukdc.confuk.com Hello [10.48.52.110]
250-TURN
250-SIZE
250-ETRN
250-PIPELINING
250-DSN
250-ENHANCEDSTATUSCODES
250-8bitmime
250-BINARYMIME
250-CHUNKING
250-VRFY
250-XXXXXXXXXXXXXXXXXXXXXXXA
250-X-EXPS=LOGIN
250-AUTH GSSAPI NTLM LOGIN
250-AUTH=LOGIN
250-X-LINK2STATE
250-XEXCH50
250 OK221 2.0.0 confukdc.confuk.com Service closing transmission channel
Also, you can use this tcpdump command to see the conversation (replace x.x.x.x by the SMTP server’s IP address or hostname):
tcpdump -vXs 0 host x.x.x.x and tcp port 25
If you have HA, it is not certain which admin VM talks to the smtp server, so best to check both.
If you don't have access to the CWMS unix shell, best to span the switch ports and run packet capture.

Established tcp connection of question

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