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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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marked as duplicate by Moab, MaQleod, studiohack Apr 9 '11 at 10:50

This question was marked as an exact duplicate of an existing question.

up vote 0 down vote accepted

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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