Possible Duplicate:
Is the Windows XP firewall good enough?
Should you worry about using third party firewall or the windows firewall is sufficient?
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closed as exact duplicate by Moab, MaQleod, studiohack♦ Apr 9 '11 at 10:50
This question covers exactly the same ground as earlier questions on this topic; its answers may be merged with another identical question. See the FAQ for guidance on how to improve it.
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On XP the firewall only monitors incoming connections. If a Trojan gets past your anti-virus then you have no way of knowing if it's "calling home". Installing a 3rd party firewall like Comodo will allow you to monitor outgoing connections as well and is a back up in case something does get past your anti-virus. Don't forget to disable the Windows one as they might not play nice together. | ||||
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You might use a third party firewall just because you have previous experience with a similar firewall on other OS. For example, people with FreeBSD background find wipfw very handy. | |||
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