Troubleshooting Windows Firewall settings in Windows XP Service Pack 2 for advanced users

Service pack 2 for XP updates the firewall software. A personal (host based) firewall is essential for any computer that connects to the Internet without a firewall at the edge of the local network, but sometimes getting the settings right can be tricky. KB article 875357 provides a comprehensive guide to troubleshooting firewall problems. Click Here