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My NAT on Xbox Live recently decided to set itself to Strict. I use a Linksys WRK54G router and i have tried everything on all the guides. I have enabled DMZ, Upnp, and forwarded all the ports, but the NAT is still strict. Any help/ideas would be greatly appreciated.
Have you tried to reset the Xbox to default factory settings? Try and reset the Xbox to the default factory settings and then configure the Xbox Live again. I was also facing the same problem which was resolved by resetting the Xbox to default factory settings. The procedure for restoring the default factory settings can be found here.