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PO.Net Socket doesn't respond to remote disconnect?
 

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    <p>I'm writing a small (C#) client application that sends data using a TCP/IP connection to a remote server. I'm using the standard .Net TcpClient object and want to leave the connection open from the client end as I am regularly submitting data packets to the server. However, it is possible that the server may close the connection, in which case I need to know to re-connect before sending my next packet.</p> <p>Using Wireshark, I can see (only) the following dialogue when the server terminates the connection:</p> <p><code>server >>> FIN, ACK<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;ACK &lt;&lt;&lt; client </code></p> <p>What I do <em>not</em> see is my client responding with a FIN of its own, to complete the connection shutdown. The result is that my client program only finds out that the connection is down after sending the next data packet.</p> <p>Is there any way I can set up TcpClient or its underlying Socket so as to complete the disconnect, and provide some feedback so that my client code knows to re-connect before sending the next packet?</p> <p><strong>Added</strong> in response to comment below: My sending code is very simple - the object that maintains the TcpClient and NetworkStream member variables, has a member function containing (essentially) the following:</p> <pre><code>bool sent = false; byte[] buffer = Encoding.UTF8.GetBytes(dataString); while (!sent) { try { m_outStream.Write(buffer, 0, buffer.Length); sent = true; } catch (Exception ex) { if (m_outStream != null) { m_outStream.Dispose(); } m_client = new TcpClient(AddressFamily.InterNetwork); m_client.Connect(ipAddress, ipPort); m_outStream = m_client.GetStream(); } } </code></pre> <p>With m_client and m_outStream initialized, this simply performs a single pass every time. Then using Wireshark I can see the server send a packet with flags <code>FIN, ACK</code> to which the client responds with <code>ACK</code>.</p> <p>The next time I call my function, the data is sent out with <code>PSH, ACK</code>, and the server responds with <code>RST, ACK</code> but does not read the incoming data. No exception is raised by the client.</p> <p>Then I call my function a second time, and an exception is raised causing the connection to be re-started.</p>
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