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[Millerboy3]

you must play with the settings... i ended up making my 360 the DMZ and turning on UPnP at the same time (not normally suggested because of possible overlap)  and it just started working again. also had to set my xbox and pc to static for it to work.  maybe this could work for you.

[drunkenmonk]

Setting your xbox to a static ip address is one way and the DMZ is fine for the xbox but not for the PC just to let you know. But it sounds like the router was giving an ip address conflict (both the xbox and the pc were using the same address) you could reset the xbox settings in the menus or press the reset button on the router for the router to reboot and get it working properly again. If you know what a DMZ is and want to play around with the router settings, make sure that the UPnP is enabled. That gets rid of a lot of headaches.