[iclassdon]

Use your local IP address and never an external address when doing port forwarding.

Confirm your local IP address first. If using Windows find/open command prompt and enter ipconfig, it will display your local IP address along with other information. Should look like 192.168.1.* depending on what your default gateway is set to. If you need more help in finding this just google "how to find my local ip address"

If all else fails using port forwarding in your routers case "Virtual Server". You could try DMZ but the downside is that it will open all the ports for the local IP address you apply it on instead of just 27015.