Hosting online games through the Windows XP firewa
If you are using the Windows XP firewall and you wish to host an online game such as Quake 3, or other applications that require users on the Internet to contact your computer directly, you will need to customize your firewall slightly to allow these specific communications through. Fortunately the XP firewall makes these changes fairly easy to do.
To customize your firewall: Go to 'start\control panel\network connections'. Right click on the network connection that has the firewall enabled and go to 'properties.' Choose the 'settings' button at the bottom. On the 'services' tab, click the 'add' button.
This window will add the application that you are using to the firewall's list of data that is allowed into your computer.
You will need to find out the port that your application uses. This information should be available from the documentation or from the software manufacturer's website.
Input a description for your convenience, then the computer name or IP address of the computer that is hosting the program, then put the port number that the program uses. Note that as long as the program is running on the computer that uses the XP firewall, the internal and external port will be the same.
Click 'ok' to apply the rule. Your firewall will now allow connections through the port you specified.
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