NIS 2009 and Xbox 360 Media Extender

I thought this information should be easy to find but I've been really struggling to get any relevant information.

 

I have Windows Media Center running on a PC under Vista Home Premium 32-bit. That PC also has NOS 2009 running on it.

 

I also have an Xbox 360 that I'm trying to set up to use as a Media Center Extender; however when the NIS 2009 firewall is active the Xbox Extender and the PC  Media Center cannot connect. If I disable the firewall they can connect.

 

Obviously exceptions need to be made in the firewall to allow Media Extenders but I can't find any instructions on how to do thos for NIS 2009. 

 

This page lists the ports needed (MS keeping it simple as usual) but where would I enetr that information inNIS 2009 andhow do you provide an exception for a "random" port?