Vbnet chat over TCP ip

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VB

Hello everyone,i have created a program for chatting which works when i select 192.16.1.2 as my ip.

Whenever i try to put my real ip i get the following error:

System.Net.Sockets.SocketException: 'The requested address is not valid in its context'

my code is :

Sub Main()
        Dim localAdd As System.Net.IPAddress = System.Net.IPAddress.Parse("192.168.1.2")
        Dim listener As New System.Net.Sockets.TcpListener(localAdd, portNo)
        listener.Start()

        While True
            Dim user As New ChatClient(listener.AcceptTcpClient)
        End While
    End Sub

So i am guessing since on my local network it worls fine,i must be making a mistake in my commands when i try to send my real ip.?
Thank in advance.

What I have tried:

<pre>Sub Main()
        Dim localAdd As System.Net.IPAddress = System.Net.IPAddress.Parse("192.168.1.2")
        Dim listener As New System.Net.Sockets.TcpListener(localAdd, portNo)
        listener.Start()

        While True
            Dim user As New ChatClient(listener.AcceptTcpClient)
        End While
    End Sub