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POSocket Dis-Connects On One End, Firewall?
 

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    <p>I have a C# application that has been running fine for several years. It connects via a TCP/IP socket to a machine that sends me stock trade executions. </p> <p>Recently, I've tried to deploy it to some machines in a new data center that is behind a hardware firewall, and I've started to see some weird dis-connects.</p> <p>When a dis-connect happens, in my app (the client side), I see nothing unusual except that I stop receiving data over the socket. Wireshark confirms that no data is reaching the socket and my application's receive thread is blocking on the Receive() call when I stop it in the debugger. The socket shows as ESTABLISHED in netstat.</p> <p>But from the server side, it looks like my client is dis-connecting. Looking at their logs, it looks like the socket on their end usually ends up with either (nRecvd=-1,errno=104) or (nRecvd=0,errno=11). (104 is connection reset by peer).</p> <p>The dis-connect only seems to happen after a period of in-activity. I have solved this for now by implementing a heartbeat between my client and their server that just sends a short message every 20 seconds and gets a reply. This has caused the dis-connects to drop to 0 over the past few days.</p> <p>At first, I figured that the hardware firewall was the problem. It was causing the socket to time out after in-activity. But the person in charge of the firewall claims that the timeout for connects on this port (8887) is 2160 minutes.</p> <p>I am running Windows Server 2003 and .NET 3.5. The trades server is a linux machine (sles9 I believe though I'm not sure).</p> <p>Any ideas on what might be going on? What could I do to debug this more given that I don't have any access to the firewall logs and no ability to change the code on the trade server?</p> <p>Thanks, Mike</p>
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    1. USMichael Covelli
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      1. USSteven Sudit
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