UdpClient监听在Windows Service中为什么没有效果？

源码贴出来了，高人看看哪里出问题了，同样的代码如果服务端是放在控制台或是webform或winform程序中都是可以的，但是在windows service中却不行 求指教！测试代码 问题很多  多多谅解
客户端源码：控制台程序
public void Main()
        {
            try
            {
                System.Net.Sockets.UdpClient udpClient = new System.Net.Sockets.UdpClient(11000);
                //向服务器发送数据
                udpClient.Connect("192.168.1.24", 12000);
                string sendStr = "我来自客户端:" + DateTime.Now.ToString();
                Byte[] sendBytes = Encoding.UTF8.GetBytes(sendStr);
                udpClient.Send(sendBytes, sendBytes.Length);
                Console.WriteLine("This is the message client send: " + sendStr);
                //等待服务器的答复，收到后显示答复，并结束对话
                IPEndPoint RemoteIpEndPoint = new IPEndPoint(IPAddress.Any, 0);
                string str =  RemoteIpEndPoint.Address.ToString();
                string str1 = RemoteIpEndPoint.Port.ToString();
                // 此处通过引用传值，获得客户端的IP地址及端口号
                Byte[] receiveBytes = udpClient.Receive(ref RemoteIpEndPoint);
                //此处获得服务器端的数据
                string returnData = Encoding.UTF8.GetString(receiveBytes);
                //Encoding.ASCII.GetString(receiveBytes); 此处若用ASCII，不能正确处理中文
                Console.WriteLine("This is the message come from server: " + returnData.ToString());
                udpClient.Close();
            }
            catch (Exception e)
            {
                Console.WriteLine(e.ToString());
            }
        }服务端：windows service中
public void Main()
        {
            UdpClient udpClient = new UdpClient(12000);
            string returnData = "client_end";
            do
            {
                IPEndPoint RemoteIpEndPoint = new IPEndPoint(IPAddress.Any, 0);
                // 此处通过引用传值，获得客户端的IP地址及端口号
                Byte[] receiveBytes;
                try
                {
                    receiveBytes = udpClient.Receive(ref RemoteIpEndPoint);
                    //此处获得客户端的数据
                    returnData = Encoding.UTF8.GetString(receiveBytes);
                }
                catch (Exception ep)
                {
                    EventLogError(ep);
                }
                Thread.Sleep(3000);
                udpClient.Connect("192.168.1.33", 11000);
                string sendStr = "服务器时间:" + DateTime.Now.ToString();
                Byte[] sendBytes = Encoding.UTF8.GetBytes(sendStr);
                udpClient.Send(sendBytes, sendBytes.Length);
            } while (returnData != "client_end");        }
        public void EventLogError(Exception ex)
        {
            FileStream fs = new FileStream("D:\\log.txt", FileMode.OpenOrCreate, FileAccess.Write);
            StreamWriter m_streamWriter = new StreamWriter(fs);
            m_streamWriter.BaseStream.Seek(0, SeekOrigin.End);
            m_streamWriter.WriteLine("--------出现异常--------" + DateTime.Now.ToString() + "\n");
            m_streamWriter.WriteLine(ex.ToString() + "\n");
            m_streamWriter.Flush();
            m_streamWriter.Close();
            fs.Close();
        }