Does anyone have a recommendation for firewall software to use on a Windows 2000 Server box that's acting as a Web server? I use BlackIce Defender on my personal workstation computer and have been very pleased with it, but its license appears to disallow using it on a Web server. I've looked at Zone Alarm Pro, which is evidently popular and appears to be well regarded, but I don't know anyone who's actually used it.

I'm guess I'm not sure if I should be looking at a different type of product for use on a server than I would for use on a workstation. Any comments or suggstions would be welcome.