I recently moved to a new PSP Comcast/Xfinity and I can't get my Airport Express to work with their modem. I called their tech support and was on the phone for almost 2 hours; We did a hard reset of both their modem and the Airport. We put it on "Bridge Mode" which allowed the Airport to work but the Internet! They finally gave up and asked me to call apple. Surely I can't be the only Xfinity customer to ever try to run Airport with their modem!