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POAn existing connection was forcibly closed by the remote host
 

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    <p>I am working with a commercial application which is throwing a SocketException with the message,</p> <blockquote> <p>An existing connection was forcibly closed by the remote host</p> </blockquote> <p>This happens with a socket connection between client and server. The connection is alive and well, and heaps of data is being transferred, but it then becomes disconnected out of nowhere.</p> <p>Has anybody seen this before? What could the causes be? I can kind of guess a few causes, but also is there any way to add more into this code to work out what the cause could be?</p> <p>Any comments / ideas are welcome.</p> <p>... The latest ...</p> <p>I have some logging from some .NET tracing,</p> <pre><code>System.Net.Sockets Verbose: 0 : [8188] Socket#30180123::Send() DateTime=2010-04-07T20:49:48.6317500Z System.Net.Sockets Error: 0 : [8188] Exception in the Socket#30180123::Send - An existing connection was forcibly closed by the remote host DateTime=2010-04-07T20:49:48.6317500Z System.Net.Sockets Verbose: 0 : [8188] Exiting Socket#30180123::Send() -&gt; 0#0 </code></pre> <p>Based on other parts of the logging I have seen the fact that it says '0#0' means a packet of 0 bytes length is being sent. But what does that really mean?</p> <p>One of two possibilities is occuring, and I am not sure which,</p> <p>1) The connection is being closed, but data is then being written to the socket, thus creating the exception above. The 0#0 simply means that nothing was sent because the socket was already closed.</p> <p>2) The connection is still open, and a packet of zero bytes is being sent (i.e. the code has a bug) and the 0#0 means that a packet of zero bytes is trying to be sent.</p> <p>What do you reckon? It might be inconclusive I guess, but perhaps someone else has seen this kind of thing?</p>
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    1. COPlease no one is willing to guess what your problem is. Post your code!
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    2. COHaha, OK, sorry. But the code is too big and complicated for even me to understand and I have been working with it for a while. I will have a go with wireshark, and if it kind of narrows down anything I might post some wireshark, and / or some code if appropriate.
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    3. CO@peter - No need to apologize. It is hard to write with an exclamation point and not seem angry/hostile.
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