Changed from a DSL modem with Linksys wireless router to an ATT U-Verse combo modem/wireless router. Have the X-Box connected to a Linksys Wireless-G Game Adapter. Have gone through all suggestions on the console configure network, xbox.com/networkhelp, ATT support, Linksys adapter support and have no success.
Have manually added the MAC address of the console and the Linksys Wireless-G adapter to the list of allowed MAC addresses, verified the Linksys is setup for WPA by ethernet connect to modem and their website. Sat on the phone with ATT support for an hour re-doing all that I'd already done.
Suggestions? Used to work fine - U-Verse is an improvement in speed but useless to me....
Modem/router 2Wire 3801HGV