Great since Xbox's are notorious for not getting registered, due to collision in the OS fingerprinting. This is a well documented problem. In my previous install they would fingerprint to OEM Wireless Router, this time it seems RIM BlackBerry. Either way they miss my auto-registration violation rule, which I may just get rid of.
So trouble started when several students tried to register their Xbox's using the registration page.
So what gives looks valid. Turns out there is a file: <PF install dir>/lib/pf/web/gaming.pm Which has a list of the first part of MAC addresses allowed to be entered into this page. Added the first 3 octets of the address to the file in the correct spot. Save the file and you are back in business.
I recommend that you verify the manufacturer of the mac. I use this site: http://www.coffer.com/mac_find/ this allows you to verify that it is a microsoft mac. Hope this helps if you come across this problem.