这段C#代码用于检测远程计算机的3389端口是否处理打开状态，可以根据实际需要设置其它端口

using System;
using System.Collections.Generic;
using System.Text;
using System.Net.NetworkInformation;
 
namespace test
{
    class Program
    {
 
 
        static void Main(string[] args)
        {
            GetTcpConnections();
        }
 
  
 
        public static void GetTcpConnections()
        {
            //code from http://www.sharejs.com/codes
 
            IPGlobalProperties properties = IPGlobalProperties.GetIPGlobalProperties();
        
            TcpConnectionInformation[] connections = properties.GetActiveTcpConnections();
            foreach (TcpConnectionInformation t in connections)
            {
                Console.Write("Local endpoint: {0} ", t.LocalEndPoint.ToString());
                Console.Write("Remote endpoint: {0} ", t.RemoteEndPoint.ToString());
                Console.WriteLine("{0}", t.State);
            }
            Console.WriteLine();
            Console.ReadLine();
        }
 
 
    }
}
 
  
 
{--运行结果：--
 
Local endpoint: 127.0.0.1:1025 Remote endpoint: 127.0.0.1:1026 Established
Local endpoint: 127.0.0.1:1026 Remote endpoint: 127.0.0.1:1025 Established
Local endpoint: 127.0.0.1:1028 Remote endpoint: 127.0.0.1:16992 CloseWait
Local endpoint: 127.0.0.1:1110 Remote endpoint: 127.0.0.1:4900 Established
Local endpoint: 127.0.0.1:2754 Remote endpoint: 127.0.0.1:1110 CloseWait
Local endpoint: 127.0.0.1:2762 Remote endpoint: 127.0.0.1:1110 CloseWait
Local endpoint: 127.0.0.1:2773 Remote endpoint: 127.0.0.1:1110 CloseWait
Local endpoint: 127.0.0.1:2913 Remote endpoint: 127.0.0.1:1110 CloseWait
Local endpoint: 127.0.0.1:3014 Remote endpoint: 127.0.0.1:1110 CloseWait
Local endpoint: 127.0.0.1:3531 Remote endpoint: 127.0.0.1:1110 CloseWait
Local endpoint: 127.0.0.1:4012 Remote endpoint: 127.0.0.1:1110 CloseWait
Local endpoint: 127.0.0.1:4900 Remote endpoint: 127.0.0.1:1110 Established