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tman, the only problem with WIndows Firewall is that it does not detect/block OUTGOING connections. Other than that I find it actually quite good. But that is a major security issue if you want to detect trojans or anyway just keep an eye on whatever wants to connect out from your machine.

Hmm. Thought it did do that but on closer inspection it appears not. Zone Alarm Pro is pretty good. They couldn't work out why I kept hitting that problem however but it was only on one of my computers so I guess it was something config specific.