thank you for your reply... My mistake was; I was trying to connect from same computer to same computer... Anyway it's working now from another computer to my computer thanks

hi all I want to make chat program using System.Net.Sockets namespace Chat examples work fine in local area network... But I couldn't get them work on internet. I have DSL router.. I setup these on adsl: NAT(Virtual servers): Protocol: TCP, External port: 399 Internal Port:399 Internal server IP address: 192.168.1.2 (which my computer's local IP) am I missing something?