08.243.2005 - An exception may not show up in the Windows Firewall graphical user interface if you create the exception by modifying the registry (KB897663)

	If you create an exception by modifying the registry on a computer that is running Microsoft Windows XP Service Pack 2 (SP2) or Microsoft Windows Server 2003 Service Pack 1 (SP1), the exception may not show up in the Windows Firewall graphical user interface. - Download Microsoft Windows XP SP2 Update - View Microsoft Knowledge Base Article - 897663 - Visit Microsoft Corporation