This program helps you opening ports for
(game) servers. The program doesn't use the Microsoft Upnp NAT API (which
doesn't work on a lot of computers) but it has it's own implementation of the
protocol which should make the program much more stable.
How to use it?
First download the port forwarder program (click
here), extract (copy/paste) the files inside the zip file to any directory
on your computer (this could be the desktop or better: C:\program files\portforwarder).
After that you open the easyportforwarder.exe file by double clicking it, wait
for the program to find your router/modem and load the list of ports opened. Now
you can add new ports by clicking the "add port" button or even easier: click
the "add game" button and select the game you want to create a server for. Click
the game and click the "add ports" button, wait for a message saying "done" then
close the program and start your game server.