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在Adobe Flash Player升级到9.0.124后，由于安全策略的更改，使得在socket或xmlsocket的应用里，原先如用http方式加载安全策略的手段不能继续使用了，类似此类应用必须使用xmlsocket://方式来提供安全策略。flashplayer的安全策略检测过程如下：

1,首先检测目标服务器的843端口是否提供安全策略

2,如果1没有检测到策略，则检测actionscript是否使用了

Security.loadPolicyFile(xmlsocket://)

手段提供安全策略，如果还没检测到，则使用第3步检测

3,检测目标服务器目标端口是否提供安全策略

C#代码如下，编译环境VS2008 + .NET framework 3.5

using System; 

using System.Text; 

using System.Net; 
using System.Net.Sockets; 
using System.Threading; 
using System.Collections; 
  
namespace serverSocket 
{ 
    class Program 
    { 
        private Thread Beginthread, receivethread; 
        private Socket serverSocket, ClientSocket; 
  
        static void Main(string[] args) 
        { 
            Program program = new Program(); 
  
            IPEndPoint remotePoint = new IPEndPoint(IPAddress.Any, 843); 
  
            program.serverSocket = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp); 
  
            program.serverSocket.Bind(remotePoint); 
            program.serverSocket.Listen(10); 
  
            Console.WriteLine("Listening..."); 
            program.Beginthread = new Thread(new ThreadStart(program.BeginListen)); 
            program.Beginthread.Start(); 
        } 
  
        private void BeginListen() 
        { 
            while (true) 
            { 
                ClientSocket = serverSocket.Accept(); 
                receivethread = new Thread(new ThreadStart(receive)); 
                receivethread.Start(); 
            } 
        } 
  
        private void receive() 
        { 
            IPEndPoint clienTep = (IPEndPoint)ClientSocket.RemoteEndPoint; 
  
            int bytes = 0; 
  
            while (true) 
            { 
                Byte[] buffer = new Byte[24]; 
                bytes = ClientSocket.Receive(buffer); 
  
                if (bytes > 0) 
                { 
                    string clientCommand = Encoding.UTF8.GetString(buffer, 0, bytes); 
  
                    String policy = "<cross-domain-policy><allow-access-from domain=\"*\" to-ports=\"2999\" /></cross-domain-policy>\0"; 
  
                    buffer = System.Text.Encoding.UTF8.GetBytes(policy.ToCharArray()); 
  
                    ClientSocket.Send(buffer, buffer.Length, 0); 
                } 
                else 
                { 
                    break; 
                } 
            } 
  
            ClientSocket.Close(); 
            receivethread.Abort(); 
        } 
    } 
}

端口可以修改为843，或者是你指定连接的任意端口。