problem in TcpClient

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hi every one this code to
send

TcpClient tcpclnt = new TcpClient("localhost", 8001);

          NetworkStream mynetsream = tcpclnt.GetStream();
          StreamWriter myswrite = new StreamWriter(mynetsream);
          myswrite.WriteLine("Your Message senaadss");
          myswrite.Close();
          mynetsream.Close();
          tcpclnt.Close();
          Console.Write(tcpclnt .Connected .ToString ());
          Console.Read();

and this to receive

            mylistener = new TcpListener(8001);

             mylistener.Start();
             System.Timers.Timer aTimer = new System.Timers.Timer();
             aTimer.Elapsed += new ElapsedEventHandler(x);
             // Set the Interval to 5 seconds.
             aTimer.Interval = 5000;
             aTimer.Enabled = true;
           Console.Read();
static void x(object source, ElapsedEventArgs e)
       {


           Socket mysocket; StreamReader str;

           while (true)
           {
               mysocket = mylistener.AcceptSocket();
               myntl = new NetworkStream(mysocket);
               str = new StreamReader(myntl);
               Console.WriteLine(str.ReadToEnd());
               Console.Read();
           }

       }

is working in local network
but i want publish on internet and when repalce localhost to IP
i have error
this

o connection could be made because the target machine actively refused it and my ip:port so ?
thanks for any help
PS> i don't have real ip