I'll apologize ahead of time as I know this has been posted countless times, but I honestly think I've read every thread on this subject and still can't find a solution that works. I received an Xbox 360 and the official wireless adapter for Christmas. I'm now back at college and trying to connect to the Internet by sharing my connection through Airport, but I keep failing the IP address test. There's no router involved in this. In my dorm room the ethernet cable goes from the wall to my MacBook Pro, and it's this connection I'm trying to share. Internet sharing is on and I've turned the firewall off. My 360 can find my network and connect to it, but that's as far as it goes. The odd thing is I also have a Wii and sharing my connection to it works flawlessly. I've seen dozens of topics suggesting entering all kinds of info manually, but nothing has worked and honestly I don't feel I should have to enter any information manually since the Wii is able to connect automatically. After the IP address test fails this is the information that the 360 obtained automatically (which doesn't work): IP Address: 169.254.17.82 Subnet Mask: 255.255.0.0 Gateway: 0.0.0.0 And this if the information in "Network" under system preferences: IP Address: 22.214.171.124 Subnet Mask: 255.255.252.0 Router: 126.96.36.199 I don't quite understand how a software company can't get this to work smoothly while Nintendo can (assuming it's not my error), but I've been trying for hours and hope someone knows the solution. Thanks for reading all that. Edit: Love the MacBook Pro btw, first Mac and not going back.