Question

Need help with SocketException

Asked by: philipjonathan

Hi all,

I have an application that runs a TcpListener to accept incoming TCP connection, and use TcpClient and NetworkStream to deal with the incoming connection. The TCP connection is maintained by both party for a long time.

This system has run for 4 months now without issue. When today out of the blue I receive SocketException for unknown reason. The message is:

System.IO.IOException: Unable to write data to the transport connection. ---> System.Net.Sockets.SocketException: An established connection was aborted by the software in your host machine

Does anybody know how to interpret that? Or any pointer where I should start searching?

I'm inclined not to blame the application, because I have 2 instances of that app running, and the other is running fine. On the other hand, I'm not inclined to blame the underlying connection also, for exactly the same reason. The 2 instances accepts TCP connections over the same leased line network. Is it possible that it's the Win OS playing up?

Btw, it's .NET 1.1 on Windows Server 2003

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Asked On
2008-09-08 at 02:31:22ID23711444
Tags

.NET, C#

,

TcpClient, TcpListener, NetworkStream, Socket

Topics

TCP/IP

,

.NET

,

C# Programming Language

Participating Experts
1
Points
500
Comments
3

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Answers

 

by: aqua9880Posted on 2008-09-08 at 07:20:06ID: 22417596

First and foremost I would check to make sure no recent windows updates effected the firewall or security settings.  Those will always screwup socket based applications.  The next thing I would double check is make sure that none of your TCP settings were changed, this can sometimes happen when windows decides to take a mental day on you.

The final thing to look at, any new applications or processes started or installed on either PC.  Socket connections can be fickle when playing nicely with other applications.

Because your application was working for 4 months, unless someone recompiled and changed your program, shouldn't be the issue.  You need to be looking for anything on your system that changed in the background.

~Aqua

 

by: philipjonathanPosted on 2008-09-08 at 07:50:23ID: 22417925

Aqua, thanks for the reply and input. Our system admin would swore that none has changed since time immemorial, I'll just double check with them, just in case they miss out small details.

For now, it seems that the problem has gone away after we restarted the app. There was another issue that appeared after restarting, which I mistakenly thought as the same as the issue in question, so I proceeded with the question anyway. Now that we are quite clear that the issue is no longer there, I'll just hold out for another 1-2 days before accepting your answer.

 

by: philipjonathanPosted on 2008-09-09 at 19:37:08ID: 22434247

The problem gone after app is restarted.

20120131-EE-VQP-002

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