Any substantial tcp/ip connection must be tracerouted to work

Before I get into my problem, I'd just like to say a quick hello to the Arch Community! (my first post).
I've been keeping an eye on Arch for some time now, waiting for a lull in my uni work so I could dedicate the proper time into installing this great sounding distro. So far, I'm thoroughly enjoying the experience despite my current snag.
Ok here goes..
I've more or less set my system up but for one problem. For some reason I cannot connect to any servers unless I traceroute them first.
Example 1: Pacman will hang no matter what I tell it to do, but if I traceroute mirror.aarnet.edu.au (my pacman mirror), pacman suddenly updates/upgrades/gets the package I want.
Example 2: I open firefox, my homepage www.todist.com will not show up unless I traceroute todoist.com!
I'm on a wireless dhcp connection, and am using netcfg2 to manage my interfaces.
I have an intel-pro-wireless 3945abg card, using module iwl3945.
I used
http://wiki.archlinux.org/index.php/Beginners_Guide and
http://wiki.archlinux.org/index.php/Network_Profiles to get to where I am now.
Code snippets:
rc.conf: http://pastebin.com/mba53b3b
netcfg2 network profile: http://pastebin.com/m2fab5e05
I'm currently strapped for time, but any response is *highly* appreciated. Just ask if you need more configs/outputs and I'll put them up asap, but atm, I'm late.
Confused as buggery
- Celthias

Well about SQL Server, I assume that everything is correct and as per rule book. Server is maintained by different team and I dont have access to server machine. They have said everything is fine @their end.
Its multi-threaded application processing approx 1 million records per day, and at any given time there could be 100 threads running parallely, so connection count would be on higher side.
There are no errors when volume is low but as soon as the volume starts increasing, we start seeing this error. My understanding is using SQL queries could be the reason because I saw this error occur when a particular SQL query is fired and this query processes huge volume of data (this is as per logs and can't be guaranteed due to multi-threading). Problem is I can't simulate this in DEV env due to low data volume.
One thing I noticed is absence of C3P0 settings in application. The provider class is configured in config file but explicit settings are missing. So not sure whether default C3P0 settings are working as expected.

Similar Messages

The TCP/IP connection was unexpectedly terminated by the server (NNTP)

I had a prior thread on this topic which was apparently closed to further posts:
http://homecommunity.cisco.com/t5/Wireless-Routers/The-TCP-IP-connection-was-unexpectedly-terminated...
so I'm opening this new thread. The problem was never solved and I could not deal with the help being offered here previously.
The problem is...
My connection to a NNTP news service which I use very frequently is reset every 10 minutes so that I get the message: The TCP/IP connection was unexpectedly terminated by the server.
I have been getting this error at least a dozen times per day for more than a year. So it has become a major annoyance and I want to fix it if possible. I wonder if there's any new insight available? I'm not a rank beginner but am far from being a router expert. I do not understand many of the router settings.
Here's a more detailed description of the problem...
After getting the error, I must then click on something else in my email client (Outlook Express) then return to click on a newsgroup under that news service, whereupon it reestablishes a valid connection for another 10 minutes. If I am active and click on various messages to read them in the newsgroup, the 10 minute timeout does not happen. It's only when I have left the connection idle without activity for 10 minutes that it times out.
This is a news server which requires an authenticated login with username and password. The same problem happens at a different news server which also requires an authenticated login with username and password. So it is not a problem unique to just one news service. It affects all news services which have an authenticated login requirement. An example news service with a sample newsgroup which has this type of problem is
news:\\news.eternal-september.org\alt.free.newsservers
It's free but you must register at http://eternal-september.org/ to use this news service.
It does not happen at open news services without any login requirements. So it is definitely related to the login requirement.
Perhaps most importantly, it does not happen if I remove the Linksys E2000 router from the circuit and connect my DSL modem directly to computer. So it is definitely a router-related problem causing this inactivity timeout every 10 minutes.
Windows XP Home SP3
Outlook Express 6
Zone Alarm 6.1.744.001
Linksys E2000 router
firmware 1.0.04 build 7
software 1.3.11006.1
connection type (WAN) DHCP
mostly the default settings used

[It is very frustrating to try to work with this board because of the short timeout invoked when editing a message! The following is what I intended to post after a bit of reflection...]
I researched this a bit and bridge mode is available via a setting in my Speedstream 4100 modem, so I don't have to call my ISP. But I'll need to research the consequences a bit more and record some variables to make sure I can get back to my current configuration. There are 3 available settings (radio buttons) in my modem...
PPP Location
WARNING
Changing these settings may interfere with your ability to connect to the Internet.
* PPP is on the modem. This is the normal mode for this modem when connected to a single computer. In this mode, the PPP session is initiated from the modem. Gateways and routers should work in this mode but their configuration may have to be changed to do so (e.g., you may need to have the gateway/router IP address changed to 192.168.1.1).
* PPP is on the computer. This mode is normally used if you need to run a PPPoE client on your PC. This mode can be used with a gateway or router which initiates a PPPoE session. To return to the DSL modem user interface you will need to directly connect your PC to the modem without any gateway or router between the modem and the PC.
* Bridged Mode (PPPoE is not used). This mode must be used if you are connecting to a non-PPPoE network. Selecting this mode will cause the modem to automatically restart.

Open more than 65k TCP/IP connections

Hello,
is it any possibility to open more than 65535 TCP/IP connections from one IP address as client? Because each connection occupied one port, I can't make more than 65k. Can be established more outgoing connections (as client) from one port to more different servers simultaneously? Thank you for any advice.
Ceny

The naive way will only let you open about 32K sockets before it fails.
In order to get more you need to reuse the socketnumbers:
#include <sys/socket.h>
void BindSockToPort(int fd, int port) {
    sockaddr_in sa= {AF_INET, port, INADDR_ANY};
    unsigned int one= 1;
    setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, &one, sizeof one);
    if(bind(fd, (sockaddr*) &sa, sizeof sa)) perror("bind");
}Then you can connect.
From same port you must of course connect to different endpoints.
And this has of course nothing to do with sun studio C++. But I had just solved the problem myselfes, so...

Java.sql.SQLException: The TCP/IP connection to the host has failed.

Hello. I hope you had a happy new year! Now its back to work.
I am having a problem connecting to a remote SQL Server DB. I am using NetBeans 5.5 and the latest J2EE. I am able to see the tables in the IDE and bind objects to data. But when I run it it gets this:
java.sql.SQLException: Error in allocating a connection. Cause: Connection could not be allocated because: The TCP/IP connection to the host has failed. java.net.ConnectException: Connection refused: no further information
at com.sun.gjc.spi.DataSource.getConnection(DataSource.java:100)
at com.sun.sql.rowset.internal.CachedRowSetXReader.connect(CachedRowSetXReader.java:344)
at com.sun.sql.rowset.internal.CachedRowSetXReader.readData(CachedRowSetXReader.java:126)
at com.sun.sql.rowset.CachedRowSetXImpl.execute(CachedRowSetXImpl.java:968)
at com.sun.sql.rowset.CachedRowSetXImpl.execute(CachedRowSetXImpl.java:1428)
I checked the SQL Server Configuration manager on that machine and TCP/IP connections are allowed. What else could be wrong?
Thank You.

"Connection refused" means that the client sends a packet saying "I would like to connect to port number NNNN please" to the server computer, and the server computer's OS sends the reply "there is no process listening to that port on the network interface you are using".
The database server is not running, or running but not listening to TCP/IP connections, or at a different port from what you think, or listening to only selected network interfaces (it is possible for a process to listen to a specific interface or a wildcard for all interfaces). A less likely scenario is that a firewall is sending the "connection refused" message.
First aid check list for "connection refused":
- Check host name in connect string.
- Check port number in connect string.
- Try numeric IP address of server host in connect string, in case name server is hosed.
- Are there any firewalls between client and server blocking the port.
- Check that the db server is running.
- Check that the db server is listening to the port. On the server, try: "telnet localhost the-port-number". Or "netstat -an", there should be a listening entry for the port. You need to configure the database to accept TCP connections; the server documentation or google should explain how.
- Try "telnet server-host-name the-port-number" from the client, to see if firewalls are blocking it.
- If "telnet" fails: try telnet with the numeric ip address.
- If "telnet" fails: does it fail immediately or after an obvious timeout? How long is the timeout?
- Does the server respond to "ping serverhost" or "telnet serverhost" or "ssh serverhost"?

TCP Socket connection in CLOSE_WAIT status and not getting closed

I am facing an issue with the TCP socket connections not getting closed and they are in CLOSE_WAIT status for ever.
As a part of batch process in our application, emails are sent with 4 embedded images. These images are downloaded from 3rd party site with IP say "UUU.XXX.YYY.ZZZ"
The images are embedded to email as follows
1. An URL object is created with the site url.
URL urlPhoto = new
URL("http://UUU.XXX.YYY.ZZZ/email/photos.jpg");
2.     The image cid is created with the URL object and the image name
HtmlEmail htmlEmail = new HtmlEmail();
String cid1 = htmlEmail.embed(urlPhoto,
"photo.jpg");
3.     The image cid is added to the email template by replacing the ${cid1} and the email is sent.
<td valign="top">
               <img src="cid:${cid1}" width="279" height="274">
          </td>
When a mail is sent, 4 new TCP connections are opened and are put in CLOSE_WAIT status for ever. For every mail sent 4 new connections are opened. In UNIX there is an upper limit on the number of open file handles (defaults to 1024) at any point of time. The open TCP connection has the underlying socket in CLOSE_WAIT status and is not getting closed at all. When the upper limit (1024) is reached the batch process is throwing the following exception and terminates.
Caused by: com.inet.tds.ap: java.net.SocketExceptionjava.net.SocketException: Too many open files
at com.inet.tds.am.a(Unknown Source)
at com.inet.tds.TdsDriver.a(Unknown Source)
at com.inet.tds.TdsDriver.connect(Unknown Source)
at java.sql.DriverManager.getConnection(DriverManager.java:525)
at java.sql.DriverManager.getConnection(DriverManager.java:171)
at com.hcomemea.batchprocess.dataaccess.database.BaseJdbcDao.openConnection(BaseJdbcDao.java:106)
... 12 more
When I run the command lsof in UNIX which list the open file handles in the system
$ /usr/sbin/lsof -p 22933 -i | grep CLOSE_WAIT
java 22933 build_master 297u IPv6 129841943 TCP integration.com:47929->UUU.XXX.YYY.ZZZ:http (CLOSE_WAIT)
java 22933 build_master 298u IPv6 129841947 TCP integration.com:47933->UUU.XXX.YYY.ZZZ:http (CLOSE_WAIT)
java 22933 build_master 299u IPv6 129841950 TCP integration.com:47936->UUU.XXX.YYY.ZZZ:http (CLOSE_WAIT)
java 22933 build_master 300u IPv6 129841970 TCP integration.com:47952->UUU.XXX.YYY.ZZZ:http (CLOSE_WAIT)
��list of 935 connections similarly�
I tried 2 solutions
1. Got the HttpURLConnection from the URL object and invoked disconnect method on the same. But it doesn�t work.
2. Ran the batch process java program with the parameter �Dhttp.keepAlive=false to close the underlying connection but didn�t help.
I need the underlying sockets to be closed and not put in CLOSE_WAIT status after sending the mail.
Is it the problem with the embed method of HtmlEmail object not closing the underlying socket connection.
If anyone has faced this issue before, kindly let me know the possible solutions for the same ASAP.
Thank you,
Ramesh G

This sounds more like a problem due to connection pooling at middle tier/application server.
If that has been ruled out, then you might to enable DCD or set expiry time on the server.

TCP IP connection From Solaris to Window?

Hello Friends,
I have SCM installed on Solaris OS,and SCM optimizer installed on WIndow OS.I need to Connect SCM Solaris to SCM window, Thought RFC type TCP/ip Connection.
For Example In Solaris SCM for TCP/IP-Program name is d:\apo\opt\ctm\bin\ctmsvr.exe and Host is Window SCM host name.
i need to know whether this Connection will work or If does not work Please Give the any Solution Friends.

Thank you all. I found an example in the internet http://documentation.softwareag.com/Crossvision/sap231/pages/drfc2rpc.htm. The situation force me to overpass my laziness and to use RFC
Yours sincerely,
Nguyen Hai Long

TCP/IP Connection. Pls advice urgent

Hello ,
My client is saying --
Switch (Non sap system) is an online system .
Switch (Non sap system) supports TCP/IP only.
Non Sap system accepts XML structure.
He has given IP address and port of Non Sap System.
Question.
1. Can I use HTTP Receiver Adapter for TCP/IP Communication
    with Addressing Type --- HTTP Destination
2. For above HTTP Destination can I make TCP/IP Connection
    (Type T) using sm59 tx.
3. I am not able to make TCP/IP Connection (Type T) if I
    have only IP address and port of Non Sap System.
How to connect XI --- Switch (Non sap system) for TCP/IP.
Regards

Your information is not very helpful.
Try to figure out, what exactly the system needs to be connected. TCP/IP is base of ANY connection between computers, this information is not useful.
What system do you want to access? Name? Vendor? Documentation?
What protocol is supported by the system? HTTP? XML?
If you do not tell more about your scenario, it is impossible to help you.
Regards
Stefan

TCP/IP connection in a loop

Dear Friends,
I am trying to make my computer with labview to communicate with another computer running VB.net application. I am basically trying to set up a TCP/IP listener. I want the VI to continuously run and send the values based on a command button. While debiggin the VB application in another computer I see that the data is sent only the first time and after that the application does not recieve any data. I am attaching the VI herewith:
Test.VI: It is the main VI
String.VI: Based on the button status I will feed different strings to the TCP connection.
I would appreciate if anyone can help me in figuring out why the connection sends data only once.
Thanks
Sankar
Attachments:
test.vi ‏28 KB
string.vi ‏13 KB

I would have to say that your problem is probably on the VB side of the equation. I don't see any "smoking gun" in your LabVIEW vi.
Take a look at your TCP read function to see what is going on.
How long are your timeouts set for on the VB side and how long does it take for the VB code to get back to waiting for the TCP Read?
How about your TCP socket connection ID on the VB side. After your read, are you possibly closing the socket or loosing the reference to it?
Does your TCP Read function return any errors? (Timeout, could not create listener, etc...)
Another possiblity is that your VB TCP function is looking for some form of termination character that it is not finding (CRLF?). The LabVIEW TCP Read function allows this mode of operation but it is not the default, I am not sure about VB.
Based on my experience with TCP, these are the things I would look at first.
I have found that the concept of TCP is fairly straight forward, however the proper and reliable management of connections is not quite as easy.
As an intermediate step, you could develop both sides of the communication in LabVIEW and stay in that mode until you are confident that you have all of the issues with sequencing, formatting, timing, etc... worked out. Once that is done, convert your TCP reader into VB code.

Discover TCP-IP connection loss using CompactRIO

I am looking for a way to detect when the
TCP-IP connection is lost in my FPGAcode on the compactRIO. I want the
FPGA to go into an "emergency" mode if the TCP-IP connection is lost to
the host computer. I have done some searching and come across the
Datalogging and Supervisory Control module for LabView but I am not
exactly sure if this is what I am looking for. I wanted to confirm that
I can do this with this module before purchasing it.
Any advice would be greatly appreciated. Thank you.

During development this happens to me all the time. Especially when timed loops are running. If the rio is spending all of it's time keeping the timed loops running, then the networking code may not execute for long periods of time (or at all). The trick is to get all the code running on the rio comfortable, with enough idle time to handle other tasks (like FTP..).
I'm not so sure what you mean about "unpredictable signals" though. One thing to keep in mind is that when you are running a vi on the rio through LabVIEW, there is overhead associated with updating the front panel on your PC. Alot of times, a deployed program will not run the same when connected to a host pc vs. running headless on the rio. I like to generate a text log file to let me know what's going on with the program when it is running headless.
Chris

TCP/IP connection not working

Hi,
I have requirement to create RFC destination for external server connection.
I have created one with TCP/IP connection by choosing registered server program radio button and specified the Gateway Host as IP address with program ID as IWAYID.
It is not connecting to external server. I have told middleware team that we need either shall script program running on the external server or some .exe program on external system (web logic is client middle ware and external system).
There any thing that I can do on ABAP side to make it successful. If not do you have any advice or suggestions to MW team what they have to do in their side?
I would appreciate your response.
Thanks
Uday Dasari

Hi Atish,
I am not clear what you are saying. the third party system is running, but when i make test connection, it simple fails, not asking user name and password for web logic server.
It is some thing required when i perform test connection.
can you please explain clearly
Thanks in advance for you reply.
Uday

The TCP/IP connection to the host 127.0.0.1 , port 1433 has failed

hi all,
i am using SQL2005 server as my database server. i am trying to connect this server in java (i mean using JDBC). i am using windows authentication to connect my sqlserver.
i have the url connection like this
DriverManager.getConnection("jdbc:sqlserver://127.0.0.1\\SQL2005/database name",username","password");
i am trying to connect the server using the above URL, but i couldn't connect it throws an error as the following.
The TCP/IP connection to the host 127.0.0.1 , port 1433 has failed. Error: "Connection refused: connect. Verify the connection properties, check that an instance of SQL Server is running on the host and accepting TCP/IP connections at the port, and that no firewall is blocking TCP connections to the port.".
could anyone plz help me to make the connection in right way.
i have tried to ping via telnet as well, even telnot not able to connect
plz help me...
thanks

Hi,
Besides Madhu mentioned, please check the TCP/IP port number of the instance of SQL Server.
1. Open SQL Server Configuration Manager, and then expand SQL Server 2005 Network Configuration.
2. Click Protocols for InstanceName, and then make sure TCP/IP is enabled in the right panel and double-click TCP/IP.
3. On the Protocol tab, notice the value of the Listen All item.
4. Click the IP Addresses tab:
If the value of Listen All is yes, the TCP/IP port number for this instance of SQL Server 2005 is the value of the TCP Dynamic Ports item under IPAll.
If the value of Listen All is no, the TCP/IP port number for this instance of SQL Server 2005 is the value of the TCP Dynamic Ports item for a specific IP address.
5. Make sure the TCP Port is 1433.
6. Click OK.
If there are any more questions, please let me know.
Thanks.
***Xiao Min Tan***Microsoft Online Community***

Multiple TCP/IP connections

Hello,
I am new with labview and I am trying to connect WAGO controller with LabVIEW 13 through modbus protocol via TCP/IP. Now, the question is how can I have multiple TCP/IP connections in the same LabVIEW project but different VIs? I am using MB ethernet master query.vi to write and read registers. Any suggestion would be very helpful to me.
Thanks and Regards

Yes, Nathan's idea is a good one to remember any time you have a common resource that will be accessed from multiple locations. In addition to instrumentation, I have used this idea for files and database connections.
An added benefit is that it allows you to redefine the interface to the resource to make it easier to access. In fact you could even use it to hide the exact nature of the resource you are accessing.
Mike...
Certified Professional Instructor
Certified LabVIEW Architect
LabVIEW Champion
"... after all, He's not a tame lion..."
Be thinking ahead and mark your dance card for NI Week 2015 now: TS 6139 - Object Oriented First Steps

How to use WAN IP with port number in TCP Open Connection ?

I have a code to write / read a WiFi device server that gets DIO / AI data through a serial port. See attachment.
The device driver has a static IP of 192.168.1.10 and port 30704 for data stream. I have a router which links my laptop and this device driver in a LAN and all is fine.
But now I want to access my device driver through the internet. For this I already have done a port forwarding in my router to direct incoming requests on 30704 port to my device driver.
The issue : I cannot reach my device driver when I enter the WAN side IP of my router like 52.23.45.131 and the Port as 30704 in the TCP Open connection.
Any suggestions ?
Thanks
Raghunathan
LV2012 to Automate Hydraulic Test rigs.
Attachments:
Remote_Logger.vi ‏32 KB

Hello,
without looking at your vi:
Did you try to reach your device from an external Computer?
Because NAT Translation cant be done (by most routers) if you try to reach yourself from the inside.
I am correct that the device created a virtual Networkcard on your computer at which you can communicate locally, right?
Did you try to use another computer in your Network, to reach your computer and the attached device?
If it is not possible, try to enable Routing at your computer.
If it is possible, your router is not forwarding (or you answered at with "no" at the first question or both).
If you are using an external computer and the networkinternal connection from another PC is working and you are 100% sure the router is set up correctly, try to disable all local firewalls and test again. (if it works you need to setup a proper fwrule).
Regards
Rene

TCP/IP connection in UDF Timeout

Hi Guys,
Can someone please tell me if there's some way to trace this. I'm doing a TCP/IP connection to an external server from our PI Dev system in a UDF. I've designed this code in an external java tool and everything works fine. I can send the message over the protocol and I get a response back but if I test the UDF in my MM it times out and kicks me off the network. I've asked the firewall guys to have a look but all they they there's no scanning on this rule and nothing's being blocked. I need to find out how come I can't get a connection to this IP and Port. Any idea? Also would I be able to run a tracert command in R/3 itself?
Thanks,
Jan
Edited by: Jan de Lange on Oct 19, 2011 9:54 AM

Hi,
I've tested my code in my 3G which gets a connection and send/receive data. However if I deploy it on PI It times out after a while. At s.connect(serverAddress, 30000); it can't get a connection to the host. There's no error message, just times out. I'll see what I can come up with working with the network people. They just HAVE to do a trace on it.
try
            System.out.println("Creating Socket: " + ip + ":" + port);
            //Create Socket Address
            SocketAddress serverAddress = new InetSocketAddress(ip, Integer.parseInt(port));
            s = new Socket();
            //Set Keep Alive Parameter
               s.setKeepAlive(true);
               //Set Read/Write Timout
               s.setSoTimeout(20000);
               //Open Connection with Address + Process Timout
            s.connect(serverAddress, 30000);
            System.out.println("Socket Created: " + s);
        catch(UnknownHostException uhe)
            // Host unreachable
            System.out.println("Unknown Host :" + ip);
               errorTrace+=(";Unknown Host :" + ip);
            s = null;

Windows Media Player no sound while playing a avi file in server and client connection using TCP/IP connection

Hello there
I have a problem with my windows media player while using server and client connection by using TCP/IP connection. So when I play a video using Windows Media Player in LabVIew there isn't any sound come out but when I'm playing a video by a Windows Media Player only the sound will come out. Can you help me solve this problem?
I also upload the vi as the reference.
The username for the client is ihsanhaikalz and the password is ganteng
Thanks
Attachments:
Client Remote.vi ‏746 KB
Server Remote.vi ‏1433 KB

Hi ican,
I was looking at your VI's but I cannot seem to pinpoint exactly where you are using Windows Media Player. In order to more quickly assist you, could you please recreate this issue more concisely in a smaller set of VIs. Also, were you able to get sound when you did not use the TCP/IP connection and simply played the files in LabVIEW?
I noticed in a few places that you were using the Play Sound File.VI from the Graphics and Sounds palette. Is that what you are refering to? I noticed there that the file path that you have designated for the song is simply the song title. Instead, this should be a path to where the song is located on your computer.
Also, if you are planning on using Windows Media Player, have you considered using the ActiveX commands for Windows Media Player? Here are a few examples if you are unfamiliar with this functionality.
Example 1 and Example 2.
I hope this helps!
Kim W.
Applications Engineer
National Instruments

Any substantial tcp/ip connection must be tracerouted to work

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