ASPX Server Page Talk to Application Server via UDPClient

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C#

ASP.NET

UDP

Hi, All,

I have an existing UDP Server Application that accepts incoming UDP packets and sends out UDP packets. The application is written in C++.

I am now developting a new web site that wants to talk to the existing Server Application. So I am using UDPClient to send and receive packets from and to the Server Application. This all works fine in the Visual Studio(2008) environment using the ASP.NET Development Server. However, when I deploy the web site to the IIS7 Web Server, no UDP packet were sent nor receiver. No error messages reported either. I wonder if anyone experienced similar problems before and aware of any solutions ?

Some sample code are as follows;


File AspxService.aspx.cs

using System;
using System.Web;
using AspxServer;
public partial class AspxService : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
        AspxServer.HeartBeatToMainServer();
        //....
    }
}

File AspxServer.cs

using System;
using System.Collections.Generic;
using System.Text;
using System.Net;
using System.Net.Sockets;

namespace AspxServer
{
   public class ASocket
   {
      private static ASocket _theSocket = new ASocket();

      public static HeartBeatToMainServer()
      {
         _theSocket.SendBeartBeat();
      }
      private void SendHeartBeat()
      {
         byte[] sendBuf = BitConverter.GetBytes((UInt16) 1000);
        _sockObj.Send(sendBuf, 2);
      }

      private UdpClient _sockObj = null;
      public ASocket()
      {
         try
         {// Create the socket and set remote server on localhost port 1001
            _sockObj = new UdpClient("localhost", 1001);
            _sockObj.BeginReceive(ReceiveCallback, null);
         }
         catch (Exception ex){ }
      }
	
      private void ReceiveCallback(IAsyncResult res)
      {
         IPEndPoint remoteEP = new IPEndPoint(IPAddress.Any, 0);
         byte[] dataBytes = _aSocket.EndReceive(res, ref remoteEP);
         //....
	_sockObj.BeginReceive(ReceiveCallback, null);
      }
   }
}