C# how to close the connections listed in tcpconnectioninformation

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I create a list of connections using TcpConnectionInformation, after it I find in that list the address which used in my program by the external IP RemoteEndPoint. Which command used to close the found connection? This task is similar to the Russinovich TCPView program.

C#

private void ClearConnection()
{
  IPGlobalProperties IPGproperties = IPGlobalProperties.GetIPGlobalProperties();
  TcpConnectionInformation[] connections = IPGproperties.GetActiveTcpConnections();
  foreach (TcpConnectionInformation tcp in connections)
  {
    if (IP_Address.Equals(tcp.RemoteEndPoint.ToString()))
    {
	// What to write to close the found connection?
    }	
  }
}

What I have tried:

I found a similar question with a solution that does not work.

C#

private void ClearConnection()
{
  IPGlobalProperties IPGproperties =
                            IPGlobalProperties.GetIPGlobalProperties();
  TcpConnectionInformation[] connections =
                            IPGproperties.GetActiveTcpConnections();
  foreach (TcpConnectionInformation tcp in connections)
  {
    if (IP_Address.Equals(tcp.RemoteEndPoint.ToString()))
    {
      Socket mySocket = new Socket(AddressFamily.InterNetwork, SocketType.Stream, 
                          ProtocolType.Tcp);
      try
      {
        mySocket.Bind(tcp.LocalEndPoint);
        mySocket.Shutdown(SocketShutdown.Both);
      }
      catch (Exception ex) {}
      finally
      {
        mySocket.Close();
      }
    }	
  }
}

Posted 3-Aug-19 6:39am

Leonid Kazakov

Updated 4-Aug-19 4:29am

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Comments

Dave Kreskowiak 3-Aug-19 14:14pm

If you're talking about connections that do not belong to your app but, instead, to other apps, you're asking for trouble. What you're going to end up doing is causing exceptions in or crashing those apps that are using those connections.

[no name] 3-Aug-19 15:01pm

What Dave said.

Afzaal Ahmad Zeeshan 3-Aug-19 15:44pm

Why can't you close the connections from inside your application before it terminates?

Leonid Kazakov 3-Aug-19 16:29pm

I am using Telegram API
https://github.com/telegramdesktop/tdesktop

WebProxy webProxy = new WebProxy(telegramProxy, true);
TelegramBotClient Bot = new TelegramBotClient(telegramToken, webProxy);
These two command create 2 connections.

I want to disconnect from the bot. I execute the code.

Bot.StopReceiving();
Bot.SetWebhookAsync("");
Bot = null;
webProxy = null;

As a result, one connection remains. When re-executing the code.

webProxy = new WebProxy(telegramProxy, true);
Bot = new TelegramBotClient(telegramToken, webProxy);

2 connections are created again. With 3 on and off cycles, 3 incomplete connections are already created. Often, Telegam considers this a violation and prohibits connecting. To solve this problem, close the application so that the garbage collector closes all connections.

Afzaal Ahmad Zeeshan 3-Aug-19 16:41pm

So, leaving it on garbage collection doesn't usually works. One thing that you can do is using this inside a using block, so that application cleans up the resources before it closes.

Dave Kreskowiak 3-Aug-19 16:53pm

Never heard of it. Never used it and I'm not going to start now.

Therein lies the problem with using libraries off of GitHub that don't have support forums attached to them. You're essentially on your own and have to figure things out yourself, and possibly even fix bugs in the project.

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Leonid Kazakov · Accepted Answer · 2019-08-04T04:29:00

First of all visit
CurrPorts: Monitoring TCP/IP network connections on Windows
and download programm CurrPorts. It seems that C # cannot solve the problem of closing the port. We will use the utility:

C#

private void ClearConnection()
{
  string programma = Directory.GetCurrentDirectory() + "\\cports.exe";
  string programmParam = "/close * * ";
  IPGlobalProperties IPGproperties = IPGlobalProperties.GetIPGlobalProperties();
  TcpConnectionInformation[] connections = IPGproperties.GetActiveTcpConnections();
  foreach (TcpConnectionInformation tcp in connections)
  {
    if (IP_Address.Equals(tcp.RemoteEndPoint.ToString()))
    {
      string[] parameters = tcp.RemoteEndPoint.ToString().Split(':');
      programmParam = "/close * * " + parameters[0] + " " + parameters[1];
      Process.Start(programma, programmParam);
    }
  }
}

Attention! This code must be run on behalf of the Administrator so that there are rights to delete the connection.