The Apple stores near me have no appointments so I thought I’d see if anyone out there might have suggestions before I camp out at the store for a few hours. My Airport Extreme was working quite fine until this morning. I see my network in the list of networks, but when I try to go to it, I’m told that there is an error joining it. I’m able to connect to the Extreme via a tethered Ethernet cord. I updated the firmware and I restarted it. The light is green and it’s in my list of networks but I can’t actually join that network (nor can my Airport Express). What on earth am I doing wrong?

Update: and the prize goes to DK for suggesting that I just needed to tell the router my lucky number and all would be well. (Tx to Dan and Joe and Jacob for taking the time to help me debug. Another techno doom averted!)