In case of game port forwarding for XP service pack 2 & 3, apart from the way we deactivate the FIREWALL of the router we can also create a virtual port with an exception of the windows default firewall by the following method:
First click on START --> then click on CONTROL PANEL --> followed by NETWORK AND INTERNET CONNECTION..(check fig. for details)
After that click on WINDOWS FIREWALL..the following screen would come up
click on the EXCEPTION TAB...the following screen would come up...as depicted below where we can put in the name of the game...follow the screenshots to configure the same.
click on Add Port...the following screen appears...
Depending on the game select TCP or UDP whichever port needs to be open. The game manual will also provide port number which are to be entered in the two provided text fields. After that click on the CHANGE SCOPE tab the following screen will appear.
Here in this small window pop-up that opens up select the last option(custom list) where the customer can put in the IP address, default gateway & subnet mask which should be a static one configured to open the port and click on ok to save the settings.
The game would be port forwarded. Enjoy!!!