How can I block certain ports for outbound communication for a set of Computers running Windows XP when joined in a Microsoft AD Domain
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Under Windows XP firewall only blocks incoming traffic. It does not monitor outbound traffic. for that functioality you would need to upgrade to windows 7. By default windows 7 also allows all outbound traffic but you can create a GPO that will turn on blocking all outbound traffic unless there is a rule to permit the traffic.

Jim B
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I know that Win7 (and Vista) can do that via GPO because they have a higher version of the firewall.. just needed to know if there is any way to do it via GPO to XP Machines :\ – Jul 02 '10 at 16:36