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POC# Async UDP listener SocketException
 

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  1. POC# Async UDP listener SocketException
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    <p>I have a pretty simple Asynchronous UDP listener, setup as a service, and it's been working quite well for awhile now, but it recently crashed on a SocketException <code>An existing connection was forcibly closed by the remote host</code>. I have three questions:</p> <ol> <li>What's causing this? (I didn't think UDP sockets had a connection)</li> <li>How can I duplicate it, for testing purposes?</li> <li>How can I cleanly handle the exception, so everything will continue to work?</li> </ol> <p>My code looks something like the following:</p> <pre><code>private Socket udpSock; private byte[] buffer; public void Starter(){ //Setup the socket and message buffer udpSock = new Socket(AddressFamily.InterNetwork, SocketType.Dgram, ProtocolType.Udp); udpSock.Bind(new IPEndPoint(IPAddress.Any, 12345)); buffer = new byte[1024]; //Start listening for a new message. EndPoint newClientEP = new IPEndPoint(IPAddress.Any, 0); udpSock.BeginReceiveFrom(buffer, 0, buffer.Length, SocketFlags.None, ref newClientEP, DoReceiveFrom, udpSock); } private void DoReceiveFrom(IAsyncResult iar){ try{ //Get the received message. Socket recvSock = (Socket)iar.AsyncState; EndPoint clientEP = new IPEndPoint(IPAddress.Any, 0); int msgLen = recvSock.EndReceiveFrom(iar, ref clientEP); byte[] localMsg = new byte[msgLen]; Array.Copy(buffer, localMsg, msgLen); //Start listening for a new message. EndPoint newClientEP = new IPEndPoint(IPAddress.Any, 0); udpSock.BeginReceiveFrom(buffer, 0, buffer.Length, SocketFlags.None, ref newClientEP, DoReceiveFrom, udpSock); //Handle the received message Console.WriteLine("Recieved {0} bytes from {1}:{2}", msgLen, ((IPEndPoint)clientEP).Address, ((IPEndPoint)clientEP).Port); //Do other, more interesting, things with the received message. } catch (ObjectDisposedException){ //expected termination exception on a closed socket. // ...I'm open to suggestions on a better way of doing this. } } </code></pre> <p>The exception is being thrown at the recvSock.EndReceiveFrom() line.</p>
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