Recently (last night) we've had trouble with our internet being extremely slow and have had unable to connect messages however our Xbox 360 was still able to connect to the internet and LIVE was able to load correctly and able to be used. However my room mate was sick of not being able to use his computer and was playing with the modem and router and now I can no longer connect to LIVE this morning and the internet is working fine.
I've went through all the steps on xbox.com/support, including restarting all of them, reloading factory settings, and the problem has been be unresolved. The support page says the problem is in the network connection and obtaining the IP address is the exact problem.
The systems/components I'm using are :
newer xbox 360 console software
Pelican PL-3669 Wireless Gaming adapter
Linksys WRT54G2- V1 Wireless Router
Scientific Atlanta 2100 Cable Modem