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copied!<p>If you try to establish a TCP connection in port range 4502-4534, Silverlight will first post a request on port 943 to retrieve the client access policy file content - It won't read the file at <a href="http://localhost.myserivce.com/clientaccesspolicy.xml" rel="nofollow noreferrer">http://localhost.myserivce.com/clientaccesspolicy.xml</a>, because this is only for HTTP requests. You need to configure your server to listen on TCP port 943, expect a request string equal to <code><policy-file-request/></code> and reply with the xml file content.</p> <p>The code below shows a basic implementation, you need to pass it a local IPEndPoint using port 943:</p> <pre><code>public class SocketPolicyServer { private const string m_policyRequestString = "<policy-file-request/>"; private string m_policyResponseString; private TcpListener m_listener; bool _started = false; public SocketPolicyServer() { m_policyResponseString = File.ReadAllText("path/to/clientaccesspolicy.xml"); } public void Start(IPEndPoint endpoint) { m_listener = new TcpListener(endpoint); m_listener.Start(); _started = true; m_listener.BeginAcceptTcpClient(HandleClient, null); } public event EventHandler ClientConnected; public event EventHandler ClientDisconnected; private void HandleClient(IAsyncResult res) { if(_started) { try { TcpClient client = m_listener.EndAcceptTcpClient(res); m_listener.BeginAcceptTcpClient(HandleClient, null); this.ProcessClient(client); } catch(Exception ex) { Trace.TraceError("SocketPolicyServer : {0}", ex.Message); } } } public void Stop() { _started = false; m_listener.Stop(); } public void ProcessClient(TcpClient client) { try { if(this.ClientConnected != null) this.ClientConnected(this, EventArgs.Empty); StreamReader reader = new StreamReader(client.GetStream(), Encoding.UTF8); char[] buffer = new char[m_policyRequestString.Length]; int read = reader.Read(buffer, 0, buffer.Length); if(read == buffer.Length) { string request = new string(buffer); if(StringComparer.InvariantCultureIgnoreCase.Compare(request, m_policyRequestString) == 0) { StreamWriter writer = new StreamWriter(client.GetStream()); writer.Write(m_policyResponseString); writer.Flush(); } } } catch(Exception ex) { Trace.TraceError("SocketPolicyServer : {0}", ex.Message); } finally { client.GetStream().Close(); client.Close(); if(this.ClientDisconnected != null) this.ClientDisconnected(this, EventArgs.Empty); } } } </code></pre>

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