XBOX Live problems with Belkin N1 router

Question

Hey,

I've been trying for days to figure this one out.  I have the Belkin N1 F5D8231-4 wireless router and I have been trying to connect my xbox 360 using the xbox wireless usb adapter.  I entered my WEP password and it connected to the router and passed every test up to the Xbox Live connection.  I tried disabling the firewall on my router and putting the xbox in a DMZ and it still couldn't connect to xbox live. 

Any help would be greatly appreciated.