Trying to use Internet Sharing, but it keeps turning off.

Hello all,
Alright, so I'm in a dorm room that connects to a wired ethernet network using 802.1X authentication. My MBP does that just fine. The only problem is getting my Xbox 360 online. The Xbox does not support 802.1X authentication, and the only thing the school said I could do was use a second ethernet port on my computer and Windows ICS. Of course, I know that Apple also has an ICS type thing of it's own through Internet Sharing.
I'm using the Linksys USB200M USB-Ethernet adapter as my second ethernet port. I've tried connecting to the internet using it and it works great.
The only problem I'm getting is keeping the Internet Sharing on. Everytime I turn it on, Share FROM Built-In Ethernet, and check mark the Ethernet Adapter (en3), the thing won't stay on. I'll change them menu, go back, and it's turned off.
I've searched for an answer, which required me to delete the com.apple.sharing.firewall.plist out of Library/Preferences. This DID NOT WORK.
I would really hate to have to boot into Windows Vista to use my Xbox 360, as I have been successful doing that. I like to work in OS X more than Vista.
Thanks for your time,
Jake

Repair Permissions if you haven't yet, then the other file that can affect that is...
/Library/Preferences/SystemConfiguration/preferences.plist
But it also holds all your Network info, so...
Reboot after either or both, depending what you decide.
Also see...
http://discussions.apple.com/thread.jspa?threadID=1179829&tstart=15

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