C Method for checking if a remote computer port is open

  • 2021-01-06 00:42:40
  • OfStack

This article illustrates C#'s method of detecting whether a remote computer port is open. Share to everybody for everybody reference. The specific analysis is as follows:

This C# code is used to detect whether port 3389 on the remote computer is handling the open state. Other ports can be set as needed


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()
    {
      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();
    }
  }
}

The running results are as follows:


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

I hope this article is helpful to your C# program design.


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