Socket (TCP) connection to proprietary port

Anyone ever tried to create a tcp socket connection to another machine on a non-reserved port from a java app loaded into Oracle 8.1.5? I have been able to do so with other sites/ports but am unable to create a socket with one particular site. I am baffled because the exact same code I am using connects perfectly if run from a non-Oracle JVM on the OS. Anyone have experienced this before?
Baffled,
Jason.

There are no problems using sockets from Oracle 8i JVM.
As you are using 8.1.5 you may need to garnt JAVAUSERPRIV or
JAVASYSPRIV roles to the users.
JAVAUSERPRIV privileges:
- open a TCP/IP socket
- read or write from a file using UTL_FILE_DIR
JAVASYSPRIV privileges:
- all the privileges associated with JAVAUSERPRIV
- create a subprocess
- listen on a specific network port
- set the socket factory
- set the stream handler
- read or write from any file
If your problem is specific please feel free to update this thread with more details.
Regards
Ravi

Similar Messages

Max. no. of Socket (TCP) Connection in Java

Dear All,
Made a java based chat program for a business application. Having serious problem, when the number of users exceeds 28 all the client sockets connected to the server throws java.io.EOFException.
Tested the server in couple of machines, when the socket connections touches 29 its not responding. Is there any limitation or setup to be done to use maximum no. of socket connection in JVM or in Operating System ?
Please help me out. Its really very very urgent
Server running in a PC machine loaded with Windows 2003 Server
Rgds
VenQuet
Edited by: venquett on Apr 8, 2008 3:54 AM

all the client sockets connected to the server throws java.io.EOFExceptionThat indicates that the server has closed them all. Are you sure that's the exception you get?
You should be able to get hundreds of connections. The limit is not imposed by Java but by your operating system, or possibly the server.

Specify the port in the client in a TCP connection

Hi,
I am programming an application using TCP sockets. I have programmed a server whith a SocketServer(port) and is waiting for client's requests (the server is a public host in the Internet). The client connect to the server by means of the method:
Socket s = new Socket(host, port);
That works correctly, but now I want to specify the port in the client. The client's PC in a machine on the Internet and it has a public IP. I tried to use the method:
Socket(String host, int port, InetAddress localAddr, int localPort)
where localAddr is the local IP of the client' PC (because I cannot know the public IP).
However, it doesn't work this method and the client cannot connect to the server. The problem is that I want to specify the port in the client in the socket TCP connection when I try to connect to the host.
How can I resolve this problem?
Thaks

I want to specify the port in the clientWhy?

OSB using socket Transport ,how to keep a TCP connection open

hi my firends,
i met a problem , our project need build an OSB to control a socket service which is able to transfer a big data file (maybe a voice file,*.wav),and the client program will play the voice file on live.
So my solution is that : keep a socket (tcp) connection open,client listen port and makes date play.
but i can't make the OSB socket transport alway open,it will timeout after a few second if have none date received.
how could i deal with it ... pls let me konw if you have any idea...i will wait you on line
thanks guys

Hi,
I'm not sure if that's achievable using OSB, and even if it was, I don't think OSB was designed having this type of application in mind...
I understand that you need a media streaming solution and I'm pretty sure that there are plenty of tools out there that can help you in doing that, and maybe some of them can be integrated with OSB in some way...
Cheers,
Vlad

Using Sockets TCP/IP to connect through Proxies and Firewalls

How to do in a Client/server Application using Sockets TCP/IP to connect through Proxies and Firewalls?
How to implement the HTTP Tunnelling in this case?
the code in Client to connect to server is:
SSLSocketFactory sslFact = (SSLSocketFactory)SSLSocketFactory.getDefault();
               socket = (SSLSocket)sslFact.createSocket(c.site, c.PORT);
          String [] enabledCipher = socket.getSupportedCipherSuites ();
               socket.setEnabledCipherSuites (enabledCipher);
               out = new ObjectOutputStream(socket.getOutputStream());
               in = new ObjectInputStream(socket.getInputStream());
The Server is an executable Standalone Application with a main Function � How to do to convert this Server in a Servlet Application?
the code in Server to wait client connections is:
Runtime.getRuntime().addShutdownHook(new ShutdownThread(this));
          try {
               SSLServerSocketFactory factory = (ServerSocketFactory) SSLServerSocketFactory.getDefault();
               SSLServerSocket sslIncoming =
                    (SSLServerSocket) factory.createServerSocket (PORT);
               String [] enabledCipher = sslIncoming.getSupportedCipherSuites ();
               sslIncoming.setEnabledCipherSuites (enabledCipher);
          while(running) {
                    SSLSocket s = (SSLSocket)sslIncoming.accept();
               newUser(s, pauseSyn);
          } catch (IOException e) { System.out.println("Error: " + e); }
some links or code sample?
Thanks in Advance

Did you see this: Networking Properties?
Including
SOCKS protocol support settings
and
http.proxyHost (default: <none>)
http.proxyPort (default: 80 if http.proxyHost specified)
http.nonProxyHosts (default: <none>
ftp.proxyHost (default: <none>)
ftp.proxyPort (default: 80 if ftp.proxyHost specified)
ftp.nonProxyHosts (default: <none>)

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?

TCP connection closed but a child process of SQL Server may be holding a duplicate of the connection's socket in SQL2008R2

Hello,
I do get the below SQL error in production environment intermittently:
TCP connection closed but a child process of SQL Server may be holding a duplicate of the connection's socket. Consider enabling the TcpAbortiveClose SQL Server registry setting and restarting SQL Server. If the problem persists, contact Technical
Support.
According to the post I search in MSDN, the above error is fixed in SQL2008R-CU6, but I have SQL2008R2-SP02 CU09 patch in production environment and the above error still occurred intermittently. I am running SQL2008R2 SP02 CU09 patch with Windows 2008R2-SP01.
I would like to know if anyone has the same error happened to their SQL environment after applied SQL2008R2-SP02 CU06 patch and later.
Any suggestion would be helpful.
Best regards,
PL.

Hello,
What happen if you apply the changes on the registry explained on the workaround section of the following article?
http://support.microsoft.com/kb/2491214
Hope this helps.
Regards,
Alberto Morillo
SQLCoffee.com

Coherence Extend remote address port in TCP Connection

Hi,
From the log below, I see remote address port is picked some random port(48552). (currently i disabled the firewall), If i enable the firewall it could be an issue, is there any way i can specify the remote ports that tcp connection use?
2011-02-24 13:18:18.076/1280.207 Oracle Coherence GE 3.6.0.1 <D6> (thread=Proxy:ExtendTcpProxyService:TcpAcceptor, member=13): Opened: TcpConnection(Id=0x0000012E56A3CA1B0A1F96B688F7EEBCEDA2AA9397203393CF480379B3963D86, Open=true, LocalAddress=10.31.150.182:9099, RemoteAddress=10.31.150.182:48552)
One more question,
I have two proxy servers, is it possible to configure the client to make two connection (redundant) one for first proxy and another for second proxy. is it make sense?
Thanks
Prab
Edited by: 833796 on Feb 24, 2011 2:35 AM

Hi Prab
The random port is what normally is called an ephemeral port for the client and is usually not a problem for firewalls since this is expected behavior. If you want to control the client port you can do this by adding the <local-address> to the tcp-initiator element.
As for the second question, it doesn't quite work to do as you suggest. The proxy contains state for the client, as this is not replicable between the proxies one cannot continue where the other one left off.
Thanks
/Charlie

Azure Worker Role can't receive tcp connection to Port 25(Smtp)

I have an SMTPE implementation as an Azure Worker Role. I have defined two input endpoints (port 25 and port 2525). Listener at 2525 accepts tcp connections from smtp clients. However port 25 can't receive connections.
When running on emulator port 25 works fine. This issue occurs when I publish my worker roles to the cloud.
I use the same code for both. InputEndpoints are also defined the same way. The only difference is the port number.
Is there any limitation related to port 25?

hi sir,
Base on my experience, Azure platform don't support out-of-the-box mail server. So I am not sure you can use SMTP on Azure cloud service. but I recommend you could refer to the
sendgrid .Also, you can follow this documents:
http://blog.smarx.com/posts/emailtheinternet-com-sending-and-receiving-email-in-windows-azure
Regards,
Will
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Excessive Port 80 TCP Connections? How many connections are normal?

Hi. I'm running MacOS X 10.3.9 on a Mac Powerbook (with all of Apple's latest Security Updates installed. It is a virgin installation and no other software programs have been installed). I then installed Norton Personal Firewall 3.0.2 in order to monitor all my ports.
By default, Norton Personal Firewall (NPF) is not set to log the number of outgoing connections for port 80, although port 80 is the port typically used by most web browsers to contact other sites on the web. If you disable port 80, then your browser will not be able to function or access the web. Therefore it is mandatory that you leave that port open. But what if some unknown hacker wrote a Trojan program to specifically ferry information out of your computer and back to him using that port, then there'd be no way to stop it once the Trojan was in place. If you disabled the port to prevent it, then you'd also disable yourself from the web. If you opened the port for your browser, then the trojan would have free and open access. At least that is the theory that has me wondering about the seemingly high number of outgoing port 80 connections displayed in my NPF logging window. Therefore, I'd very much like to find out if other users who are running a version of Panther with NPF are experiencing the same high connections behavior on port 80.
To create the scenario for this behavior, basically you just open your NPF panel and enable all logging for port 80 (by default it is disabled). For those of you who don't specifically know how to do this, the following is the directions . . .
. . . Open your NPF Service Settings pane. From this pane, highlight the service called Web Sharing Port 80. Click the Edit button at the bottom of the selection window. A new pane will then show the controls named Ports, Logging, and Notification. Bring forward the Logging controls and enable both checkboxes for Allowed and Denied for the Outgoing direction. Click Save and close the window.
Once the above is done, close all other windows and open your NPF Logging window on your desktop and keep it visible for you to look at. Clear all existing entries in the log so you'll start with a clean slate. With everything set up and a web connection available, open your Safari browser (or any browser) to an online web site. On my computer, my Safari bowser is set to open to Apple's website - www.apple.com. Once the browser is open, Apple's website is then displayed.
The result . . . surprisingly, after only a few seconds, a HUGE number of port 80 TCP connections to that website address start to show up and flow into my log. In a matter of only 3 or 4 seconds, at least 250 separate TCP connection entries will show up in my log, and they all have the same web address. If I then click on anything on the page or surf to any other website, the log entries will change to the new site address and start up again, and in some cases, in a matter of less than a minute the number of entries can easily reach into the thousands. I've seen 20,000 entries or more flow into my log after a couple of minutes. And the only way to stop the madness and the entries is to disconnect from the web. Those many entries and this behavior does not seem normal to me, no matter what port is selected and no matter what log settings are enabled. A dozen to 15 or 20 entries for a given site I can understand (I've been told some browsers can open at least 10 connections at a time), but hundreds to thousands, I cannot. I can't understand why any program under any circumstance would need to generate those many log entries in such a short time frame. My problem is I have nothing to compare this data to, I only have my suspicions and have no way of knowing whether this behavior is normal or not. So I am asking for others to make a comparison on their computer if you are running any version of Panther and Norton Personal Firewall and give me your results so I can determine what is normal or not. I've heard of certain hacker attacks called TCP flooding and other forms of attacks, and I don't want my computer to have been secretly taken over by a hacker or the initiator of such attacks unknowingly. Furthermore, this is not anything an average user would even normally notice, simply because Port 80 logging is not usually enabled in NPF. Nevertheless, I need to find out the root of this problem and learn whether this is normal. Other than these high number of connection entries, my web surfing seems normal and I haven't yet experienced any seeming sluggishness accessing sites. Any help anyone can offer I would appreciate. Thanks to everyone in advance.
Here are some images of my own settings and results:
http://homepage.mac.com/starshone/misc/Port80Settings.jpg
http://homepage.mac.com/starshone/misc/Port80Log.jpg
Mac OS X (10.3.9)

But all those connections are how the web works. Each HTML page has dozens or more links. Each graphic or other page element is a new HTTP request on port 80 back to the originating server (or another server even). So it's normal to have a lot of port 80 connections going out if you surf the web.
You can see the individual elements that make up a page in Safari by going to the "Window" menu and showing the "Activity" window. I see CNN's web site tonight has 113 items on its home page. Apple's is 41. My home page is 10. So it's easy to get a lot of connections.
Some applications also use port 80 to check for updates, so you might see the occasional port 80 connection even when you're not surfing the web. These are also nothing to worry about.
charlie

2 way TCP connection using IP addresses

Hi All,
I need to pass data in both directions between 2 pc's connected to the internet. I am aware of the various TCP/IP and data socket examples, I am using Labview 7.0. I dont know much about the ptotocol involved but figure I only need a few pieces of info.
If the server machine wants to connect to a client machine on the same network I understand no changes are required to the example vis (ie port 2055 used in Simple Data Server). But what would happen if the server PC wanted to connect to a client in a different country? Is that when IP addresses are needed?
I imagine my final vi front panel will have a "This machines IP Addr" and "Client's IP Addr" text box, operators of the machines then tell the other person their mac
hine IP address which is entered manually to setup a 2 way link.
Is it possible to get Labview to find the full IP address of the machine ready for the other user to type in. Thanks in advance
Regards Chris

On the client side the users will need to fill in the IP address or domain of the server. If that IP is on the Internet or somewhere else that will work as long as the client PC has physical access and permission to open a tcp connection (no firewalls that block the port you are using etc.)
Make a connect dialog that pops up if the user chooses to connect and have the user input the IP there and click OK. You can add functionality like bookmarks and "home page" to make things easier. If a home page / server is defined the client can connect to that upon startup. You may want also to add functionality that will reconnect in the background if the connection is lost.
The client's IP is of less interest. If you need it though just use the string to IP function
and the IP to string function from the tcp/ip palette. Do not wire anything to the former funtion but wire it's output to the latter. The latter will then output the IP of the local PC.
MTO

Still looking for anwers to TCP Connection data

Can flash monitor TCP connection status? I need to read it
somehow and then send that info back to the server. Posted this a
number of weeks ago, but not a single nibble.
Anyone?

The server only uses port 80 in this case, and we are not
connecting to any other domains. He can't seem to get a policy file
to work, so the whole thing has now become my fault.
The deal is, using the .close(); method works fine, but his
PHP is pushing the file anyway. It took me a week to discover that
this issue isn't mine. But .. the php developer is convinced that I
haven't written the AS properly, or we wouldn't have this issue. I
simply state that the way I am using the .close() method works
fine, but his code is overriding it, which is out of my hands. But
I am trying to find a solution, and we are both thinking this
socket connection may be it, we just can't get it to work without
errors.
Funny, he pointed me to a site that he says does exactly what
he wants this to do, and it throws at least six errors before the
song finally plays. He has not acknowledge that minor deatil yet.
:)

TCP Connect Timeout

Does anyone know of a way to increase the TCP connection timeout on Linux (RedHat ES 3.0, 2.4.21-9.0.3.ELsmp). We currently always keep a "dead" server in our imqAddressList for failover. The server has nothing listening on the portmapper port, 7676. When I telnet over regular Internet it takes less than a second to get a connection refused response:
telnet: Unable to connect to remote host: Connection refusedWhen I telnet to this server over a low bandwidth satellite connection, I get a timeout after 3 minutes:
[root@client# time telnet server 7676
Trying X.X.X.X...
telnet: connect to address X.X.X.X: Connection timed out
real    3m15.393s
user    0m0.010s
sys     0m0.000sWe currently have 3 servers in our imqAddressList and imqReconnectAttempts is set to 0. However, since one of the 3 servers is dead, 1/3 of the time it takes over 3 minutes to get a connection. I'd imagine that the socket connection from IMQ is exhibiting the same behavior as telnet.
Is there anywhere that I can tweak this timeout?
Thanks,
Aaron

You need to call connect on a socket set to non-blocking mode with fcntl, and then use select with a timeout to limit the amount of time you will wait for the connect to complete. If select returns because you timed out, then close the socket and return an error. If select returns because of an event on the socket, you use getsockopt to determine if the connect succeeded or not.
See Stevens, Unix Network Programming Vol 1 for details. Comments in the code I'm looking at say page 411.
Hope this helps.

Array of tcp connections

hello everyone,
I want to creat an array of servers to connect to (configurable hots:port) and send a command to be invoked like "something\n"
then close the tcp connection? whereis a good place to start reading about this or maybe a snip of code or two like the array part at least, I would be greatful. Any references is great... thank you.

I think reading the manual and learning would be a much better choice than asking for a very specific case, as it improves your knowledge and skill. Read these and you will be able to write your own stuff:
Socket documentation:
http://java.sun.com/j2se/1.5.0/docs/api/java/net/Socket.html
Collections framework documentation:
http://java.sun.com/j2se/1.5.0/docs/guide/collections/reference.html
Tutorial on how to use Sockets:
http://java.sun.com/docs/books/tutorial/networking/sockets/index.html

Creating a TCP connection with SSL/TLS

Hi,
I am working in a application that depends on the server. I need to estabilish a TCP connection with SSL/Tls secure connection with the server in order to get the datas.
I have the following code structure :
- (id)initWithHostAddressNSString*)_host andPortint)_port
[self clean];
self.host = _host;
self.port = _port;
CFWriteStreamRef writeStream;
CFReadStreamRef readStream;
return self;
-(BOOL)connect
if ( self.host != nil )
// Bind read/write streams to a new socket
CFStreamCreatePairWithSocketToHost(kCFAllocatorDef ault, (CFStringRef)self.host, self.port, &readStream, &writeStream);
return [self setupSocketStreams];
- (BOOL)setupSocketStreams
// Make sure streams were created correctly
if ( readStream == nil || writeStream == nil )
[self close];
return NO;
// Create buffers ---- has not been released , so need to check possible ways to release in future
incomingDataBuffer = [[NSMutableData alloc] init];
outgoingDataBuffer = [[NSMutableData alloc] init];
// Indicate that we want socket to be closed whenever streams are closed
CFReadStreamSetProperty(readStream, kCFStreamPropertyShouldCloseNativeSocket, kCFBooleanTrue);
CFWriteStreamSetProperty(writeStream, kCFStreamPropertyShouldCloseNativeSocket, kCFBooleanTrue);
//Indicate that the connection needs to be done in secure manner
CFReadStreamSetProperty(readStream, kCFStreamPropertySocketSecurityLevel, kCFStreamSocketSecurityLevelNegotiatedSSL);
CFWriteStreamSetProperty(writeStream, kCFStreamPropertySocketSecurityLevel, kCFStreamSocketSecurityLevelNegotiatedSSL);
// We will be handling the following stream events
CFOptionFlags registeredEvents = kCFStreamEventOpenCompleted |
kCFStreamEventHasBytesAvailable | kCFStreamEventCanAcceptBytes |
kCFStreamEventEndEncountered | kCFStreamEventErrorOccurred;
// Setup stream context - reference to 'self' will be passed to stream event handling callbacks
CFStreamClientContext ctx = {0, self, NULL, NULL, NULL};
// Specify callbacks that will be handling stream events
BOOL doSupportAsync = CFReadStreamSetClient(readStream, registeredEvents, readStreamEventHandler, &ctx);
BOOL doSupportAsync1 = CFWriteStreamSetClient(writeStream, registeredEvents, writeStreamEventHandler, &ctx);
NSLog(@"does supported in Asynchrnous format? : %d :%d", doSupportAsync, doSupportAsync1);
// Schedule streams with current run loop
CFReadStreamScheduleWithRunLoop(readStream, CFRunLoopGetCurrent(), kCFRunLoopDefaultMode);
CFWriteStreamScheduleWithRunLoop(writeStream, CFRunLoopGetCurrent(), kCFRunLoopDefaultMode);
// Open both streams
if ( ! CFReadStreamOpen(readStream) || ! CFWriteStreamOpen(writeStream))
// close the connection
return NO;
return YES;
// call back method for reading
void readStreamEventHandler(CFReadStreamRef stream,CFStreamEventType eventType, void *info)
Connection* connection = (Connection*)info;
[connection readStreamHandleEvent:eventType];
// call back method for writing
void writeStreamEventHandler(CFWriteStreamRef stream, CFStreamEventType eventType, void *info)
Connection* connection = (Connection*)info;
[connection writeStreamHandleEvent:eventType];
`
As above, I have used
CFReadStreamSetProperty(readStream, kCFStreamPropertySocketSecurityLevel, kCFStreamSocketSecurityLevelSSLv3);
CFWriteStreamSetProperty(writeStream, kCFStreamPropertySocketSecurityLevel, kCFStreamSocketSecurityLevelSSLv3);
in order to make a secured connection using sockets.
The url i am using is in the format "ssl://some domain.com"
But in my call back method i am always getting only kCFStreamEventErrorOccurred for CFStreamEventType .
I also tried with the url "https://some domain.com" ,but getting the same error.
i also commented out setting kCFStreamPropertySocketSecurityLevel, but still i am receiving the same error that i mentioned above.
I dont know how it returns the same error. I have followed the api's and docs , but they mentioned the same way of creating a connection as i had given above.
I tried to get the error using the following code :
CFStreamError error = CFWriteStreamGetError(writeStream);
CFStreamErrorDomain errDomain = error.domain;
SInt32 errCode = error.error;
The value for errCode is 61 and errDomain is kCFStreamErrorDomainPOSIX. so i checked out the "errno.h", it specifies errCode as "Connection refused"
I need a help to fix this issue.
If the above code is not the right one,
**(i)how to create a TCP connection with SSL/TLS with the server.**
**(ii)How the url format should be(i.e its "ssl://" or "https://").**
**(iii)If my above code is correct where lies the error.**
I hope the server is working properly. Because I can able to communicate with the server and get the datas properly using BlackBerry and android phones. They have used SecuredConnection api's built in java. Their url format is "ssl://" and also using the same port number that i have used in my code.
Any help would be greatly appreciated.
Regards,
Mohammed Sadiq.

Hello Naxito. Welcome to the Apple Discussions!
Try the following ...
Perform a "factory default" reset of the AX
o (ref: http://docs.info.apple.com/article.html?artnum=108044)
Setup the AX
Connect to the AX's wireless network, and then, using the AirPort Admin Utility, try these settings:
AirPort tab
o Base Station Name: <whatever you wish or use the default>
o AirPort Network Name: <whatever you wish or use the default>
o Create a closed network (unchecked)
o Wireless Security: Not enabled
o Channel: Automatic
o Mode: 802.11b/g Compatible
Internet tab
o Connect Using: Ethernet
o Configure: Manually
o IP address: <Enter your college-provided IP address>
o Subnet mask: <Enter your college-provided subnet mask IP address>
o Router address: <Enter your college-provided router IP address>
o DNS servers: <Enter your college-provided DNS server(s)
o WAN Ethernet Port: Automatic
<b>Network tab
o Distribute IP addresses (checked)
o Share a single IP address (using DHCP & NAT) (enabled)

Socket (TCP) connection to proprietary port

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