I have already tried changing them from Managed to Unmanaged and back to Managed (this actually brought 2 of my 4 troublesome APs back online). I also tried deleting them from ExtremeCloud IQ and adding them again. This didn’t help. I’m looking for other things to try.
Best answer by Sam Pirok
Do you have a console cable (RJ45-USB)? You can plug directly in to the AP to reach the CLI if you need to. Or you might be able to find the current IP address in your DHCP server.