XBox 360 as Media Extender & Smart Firewall

I'm about to blow a gasket; hoping someone can help me figure this out before that happens.

 

I have Norton Security Suite from Comcast.  It uses Smart Firewall, and Smart Firewall will not allow me to use my XBOX 360 as a windows media extender.  I've googled and searched and whatever else, and nobody has good instructions on how to make this happen.  Microsoft has about 25% of the info and Norton documentation seems to be completely useless in this department.

 

This is all microsoft tells me:

http://www.microsoft.com/windows/windows-media-center/learn-more/extenders/help/extenders-firewalls.aspx#NonMSFT

 

So I have been poking around in the Norton program/documentation, trying to figure out how to get the MSFT info to work with Norton, with no luck.

 

Has anybody else figured out how to do this?  I'd love some GOOD instructions on how to solve this problem.  Sincerely, I'd just turn the **bleep** Smart (hah!) Firewall off and use Windows' ... except then the Norton program complains that I'm not using its firewall and I don't like it when my computer complains to me.