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copied!<p>You are getting an exception from <code>handler.EndReceive()</code>. While admittedly it is unclear <em>why</em> you’re receiving the specific exception you mentioned, when put into production this code <em>will</em> throw exceptions every time there is a network communication problem (which is common).</p> <p>Therefore, you should probably put a try/catch around the call to <code>EndReceive()</code> anyway. Think about what your code would need to do whenever the connection fails or the server dies or whatever.</p> <p>Then you can start diagnosing specific problems. One important thing you haven’t specified: do you get this error only <em>occasionally</em> or do you reproducibly get it <em>all the time</em>? If it’s the former, then it might just be normal Internet connectivity fluctuations. Your software will have to be able to handle those. If it’s the latter, then I think it sounds like a problem on the server. When you call <code>BeginReceive()</code>, your system will start waiting for something from the server; if that “something” is that it received data, then <code>EndReceive()</code> will succeed, but if that “something” is that the server has <em>closed the connection</em>, your callback will still be invoked, and then <code>EndReceive()</code> will throw the relevant <code>SocketException</code>. This is by design because there’s pretty much no other way to communicate to your code that the server has closed the connection.</p> <p><strong>EDIT:</strong> Looks like your server code needs the same error handling: its call to <code>EndReceive()</code> is equally prone to throwing an exception if the <em>client</em> closes the connection. (I know you have a try/catch around the whole big thing, but it outputs a <em>MessageBox</em>... that is not going to work well on a server, unless you want someone sitting there all the time clicking on all the OK buttons...)</p>

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