To create exceptions for a program in Windows XP, follow these steps. In this case, when the program tries to access a port, Windows Firewall enables access to that port. Instead, you can create exceptions for the program itself. When you use Windows XP Service Pack 2 (SP2), you do not have to manually create port exceptions in Windows Firewall. This provides a line of defense against someone who might try to access your computer from outside Windows Firewall without your permission.

Windows Firewall, previously known as Internet Connection Firewall (ICF), is a protective boundary that monitors and restricts information that travels between your computer and a network or between your computer and the Internet. More Information Windows Firewall in Microsoft Windows XP This article also lists the port addresses that must be open on computers that are not running Windows Firewall but instead are using a proxy server, a router, Network Address Translation (NAT), or Internet Connection Sharing. Additionally, this article describes the advantages of enabling UPnP architecture that supports peer-to-peer Plug and Play functionality for network devices. This article describes the ports that you must open in Microsoft Windows Firewall to play or to host a Microsoft Age of Empires III multiplayer game.

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