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POSendAsync runs but the data is not really sent
 

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    <p>I have an application that communicate through sockets using the *Async methods (like <a href="http://msdn.microsoft.com/en-us/library/system.net.sockets.socket.sendasync.aspx" rel="nofollow">SendAsync</a>). I'm getting this strange behavior where SendAsync is executed but the data is not sent over the wire.</p> <p>I've enabled network tracing and got the following log:</p> <pre><code>System.Net.Sockets Verbose: 0 : [4300] Socket#5024928::SendAsync() System.Net.Sockets Verbose: 0 : [4300] Socket#5024928::SendAsync(Boolean#1) System.Net.Sockets Verbose: 0 : [7320] Data from Socket#5024928::FinishOperation(SendAsync) System.Net.Sockets Verbose: 0 : [7320] 00000E8C : 01 99 27 00 00 00 01 00-00 00 00 00 00 00 00 00 : ..'............. System.Net.Sockets Verbose: 0 : [7320] 00000E9C : 00 00 00 00 00 00 00 00-00 00 00 00 00 00 00 00 : ................ System.Net.Sockets Verbose: 0 : [7320] 00000EAC : 00 00 00 00 00 00 00 00-00 00 00 00 00 00 00 00 : ................ System.Net.Sockets Verbose: 0 : [7320] 00000EBC : 00 00 00 00 00 00 00 00-00 00 00 00 00 00 00 00 : ................ System.Net.Sockets Verbose: 0 : [7320] 00000ECC : 00 00 B3 F4 : .... System.Net.Sockets Verbose: 0 : [7320] Socket#5024928::ReceiveAsync() System.Net.Sockets Verbose: 0 : [7320] Exiting Socket#5024928::ReceiveAsync() -&gt; Boolean#1 System.Net.Sockets Error: 0 : [7320] Socket#5024928::UpdateStatusAfterSocketError() - TimedOut </code></pre> <p>Although the trace shows that the data was sent (and a receive timeout occurred), the data was not really sent. I've checked with Microsoft's Network Monitor and there's no log of this data being sent.</p> <p>The send method is pretty straightfoward:</p> <pre><code> public void Send(AsyncClientState state, byte[] data) { var socket = state.Socket; var dataTransferredEventArgs = new DataTransferredEventArgs(data, _maxBytes) { State = state }; state.Events.RaiseBeforeSend(dataTransferredEventArgs); byte[] bytesToSend = dataTransferredEventArgs.Bytes.ToArray(); SocketAsyncEventArgs args = GetSocketAsyncEventArgsArgs(socket, bytesToSend.Length); if (args == null) { state.Events.RaiseTimeout(Operation.Send); return; } args.Completed += SendCompleted; args.UserToken = state; Buffer.BlockCopy(bytesToSend, 0, args.Buffer, args.Offset, bytesToSend.Length); bool sendAsync = socket.SendAsync(args); if (!sendAsync) { SendCompleted(this, args); } } private void SendCompleted(object sender, SocketAsyncEventArgs e) { var state = (AsyncClientState) e.UserToken; var events = state.Events; try { if (e.SocketError != SocketError.Success) { events.RaiseError(new ErrorEventArgs("(SendSocketError)" + e.SocketError)); return; } if (e.LastOperation == SocketAsyncOperation.Send) { e.Completed -= SendCompleted; _asyncEventArgsPool.PutBack(e); events.RaiseAfterSend(new StateEventArgs(state)); } } catch (ObjectDisposedException) { } catch (SocketException ex) { events.RaiseError(new ErrorEventArgs(string.Format("{0}: {1}", ex.SocketErrorCode, ex.Message))); } } </code></pre> <p>Am I missing something here? Is the network tracing really reliable?</p> <p><strong>UPDATE</strong></p> <p>I tried to use Begin/End*, but still the same problem. Here is the trace:</p> <pre><code>System.Net.Sockets Verbose: 0 : [6632] Socket#29357909::BeginSend() System.Net.Sockets Verbose: 0 : [6632] Exiting Socket#29357909::BeginSend() -&gt; OverlappedAsyncResult#30136159 System.Net.Sockets Verbose: 0 : [6500] Data from Socket#29357909::PostCompletion System.Net.Sockets Verbose: 0 : [6500] 00000000 : 01 99 27 00 00 00 01 00-00 00 00 00 00 00 00 00 : ..'............. System.Net.Sockets Verbose: 0 : [6500] 00000010 : 00 00 00 00 00 00 00 00-00 00 00 00 00 00 00 00 : ................ System.Net.Sockets Verbose: 0 : [6500] 00000020 : 00 00 00 00 00 00 00 00-00 00 00 00 00 00 00 00 : ................ System.Net.Sockets Verbose: 0 : [6500] 00000030 : 00 00 00 00 00 00 00 00-00 00 00 00 00 00 00 00 : ................ System.Net.Sockets Verbose: 0 : [6500] 00000040 : 00 00 B3 F4 : .... System.Net.Sockets Verbose: 0 : [6500] Socket#29357909::EndSend(OverlappedAsyncResult#30136159) System.Net.Sockets Verbose: 0 : [6500] Exiting Socket#29357909::EndSend() -&gt; Int32#68 System.Net.Sockets Verbose: 0 : [6500] Socket#29357909::BeginReceive() System.Net.Sockets Verbose: 0 : [6500] Exiting Socket#29357909::BeginReceive() -&gt; OverlappedAsyncResult#63504289 System.Net.Sockets Verbose: 0 : [6500] Socket#29357909::EndReceive(OverlappedAsyncResult#63504289) System.Net.Sockets Error: 0 : [6500] Socket#29357909::UpdateStatusAfterSocketError() - TimedOut System.Net.Sockets Error: 0 : [6500] Exception in Socket#29357909::EndReceive - A connection attempt failed because the connected party did not properly respond after a period of time or established connection failed because connected host has failed to respond. System.Net.Sockets Verbose: 0 : [6500] Exiting Socket#29357909::EndReceive() -&gt; Int32#0 </code></pre>
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    1. COHave you checked the contents of arg before calling SendAsync?
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    2. CO@Jani not sure if I understood you, but the content is correct (as per the trace)
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    3. COAnother thought: don't you have any firewall or antivirus on you system which might block the app.
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