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copied!<p>I"ve been working with <code>AcceptEx</code> and IOCP, and I never-ever saw such a problem.</p> <p>About your code. It's hard to say what's wrong exactly in it, since it's not complete. But I'm pretty sure the problem is there.</p> <p>One problem that I see is that the 3rd parameter you supply to <code>AcceptEx</code> is a <strong>local</strong> buffer. This is wrong, because this buffer should remain valid for the duration of the accept operation. What you did may easily lead to the stack memory corruption of whatever.</p> <p>But your "spurious accept" problem is probably caused by something else. And I suspect that I know what's the problem. Let me guess:</p> <ol> <li>You use the same IOCP for both listening and accepted (client) socket. This is reasonable, there's no need to have more than 1 IOCP.</li> <li>When you dequeue a completion from the IOCP - you automatically cast it to <code>WORK_ACCEPT</code> and call <code>HandleAcceptedConnection</code>. Don't you?</li> </ol> <p>If so - the problem is obvious. You call the <code>WSARecv</code> on the client socket. It completes, and the completion is queued the the IOCP. You fetch it, however you treat it as a completed accept. You cast it to <code>WORK_ACCEPT</code>, which looks junky (simply becase it is <strong>not</strong> a <code>WORK_ACCEPT</code> structure).</p> <p>If this is the case - you <strong>must</strong> add a way to distinguish different completion types. For instance you may declare a base struct (from which all the completions would inherit), which would have a type member, which will identify the completion type.</p>

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