I was just at a site that said it. Personal Firewalls are "snake oil," and really aren't worth the trouble. I agree with the site that the ideal firewall is probably an old box running linux or bsd, with my computers connected through it. But to say that the firewall I and many others have on our machines is garbage and not worth the nuisance of false warnings is a bit much. Mine has stopped only a couple of legitimate attempts in the past year, but one is too many. The site? SamSpade.org.