I've got a 4th gen extreme and a current-gen express. I want to use the express to extend the wireless network of the extreme. I've got it on the same SSID, same password, etc. Yet I get 'Unable to extend wireless network' from the express. I have the express plugged in to the extreme (LAN port on the extreme to the WAN port on the express). A client plugged into the express via its LAN port is working fine. Am I not able to extend via a wired connection? It would seem to defeat the purpose of extension if so. But I can't figure out what I'm doing wrong.