User blog comment:H3rosnvrfall/Trouble Port Forwarding/@comment-4089433-20110622213724/@comment-68.58.143.33-20110623011724

It could be Norton or Windows firewall that's blocking it then. I believe Norton disables Windows Firewall when you install it but I could be mistaken. What you will need to do is open your Norton firewall options and either disable it while you host your server or make Norton allow both Terraria.exe and TerrariaServer.exe. I haven't used Norton personally so I cannot tell you specifically how to allow a program through. With this you will have to go to the Norton website and ask for help there or search for a tutorial online. If you cannot find one I am willing to help you search so just let me know. You need to make sure you forward the port and allow the program through your firewall, then test it with someone. Let me know if you have further trouble with it.