How do you know https(8443) port is open & How do you know ftp port is open

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C#

How do you know https(8443) port is open

How do you know ftp port is open

Posted 13-Feb-14 0:24am

saeedsos0072008

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2 solutions

Solution 2

try this.

C#

bool IsOpen(int port)
{
IPGlobalProperties Properties = IPGlobalProperties.GetIPGlobalProperties();
IPEndPoint[] EndPoints = Properties.GetActiveTcpListeners();
foreach (IPEndPoint i in EndPoints)
{
if (i.Port == port)
return true;
}
return false;
}

Posted 13-Feb-14 0:56am

Silent Guardian

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Vedat Ozan Oner · Accepted Answer · 2014-02-13T00:35:00

you don't have to write code to check whether a port is open or not. you can use telnet application:

telnet localhost 21

But if you need to check it in code, you can use TcpClient:

C#

using System;
using System.Collections.Generic;
using System.Linq;
using System.Net.Sockets;
using System.Text;
using System.Threading.Tasks;

namespace Test_TcpConnect
{
    class Program
    {
        static void Main(string[] args)
        {
            try
            {
                using (TcpClient cl = new TcpClient("localhost", 21))
                {
                    Console.WriteLine("connected");
                }
            }
            catch (Exception ex)
            {
                Console.WriteLine(ex);
            }
        }
    }
}