Sockets Ports

[bobbynad]

Hello

 

Please Let me know to connect the server using the free ports available at time from the client machine usings sockets.

[dynamic_sysop]

you would need to catch a " port already in use " error ( then maybe loop back to your connecting code to try a different port )

to test for an open / used port you could do something along these lines...

       Try
           Dim ip As System.Net.IPHostEntry = System.Net.Dns.GetHostByName(System.Net.Dns.GetHostName())
           Dim ipaddy As Net.IPAddress = ip.AddressList(0)
           Dim ep As New Net.IPEndPoint(ipaddy, 80)
           Dim listner As New Net.Sockets.TcpListener(ep)
           listner.Start()

       Catch ex As SocketException
           If ex.ErrorCode = 10048 Then '/// error number for Port already in use.
               MessageBox.Show("The port you attempted to connect to is already in use!")
           Else
               MessageBox.Show(ex.ErrorCode & "   " & ex.Message)
           End If
       End Try