I still have the old SPF install file. I could've installed it on my new computer. But using unmaintained security software is like building a fence with rotten wood and letting it fall apart.
What firewall did I install? I settled on Outpost Firewall Pro. I haven't heard many endorsements for it, but I heard no negative comments, unlike Zone Alarm. One thing about Outpost is that it is not free, although you can download it and try it for free for 30 days. The initial license fee is $39.99, and annual updates after one year is $19.99. (But if it turns out that Germany has the most shutout games in this year's World Cup, I'll get the annual updates for free. See this promotional page to understand why.)
If you're committed to using a free product, you can try Zone Alarm. You can also try Jetico Personal Firewall, which I discovered after installing Outpost. Version 18.104.22.168 of Jetico was given the Gold Award by Firewall Leak Tester on March 11, 2006, based on its ability to pass leak tests. One thing Firewall Leak Tester doesn't do is give any indication of how stable each product is.
While I'm at it, let me give you some firewall testing resources.
- Again, there's Firewall Leak Tester, which not only publishes test results, it also offers a directory of tests that you can run on your own system. And there's plenty of advice, too.
- The home page of Gibson Research Center, and their Shields Up test in particular.
- Various tests on the PC Flank web site.