One master controller at main site running 6.1.3.3 and several AP's at branch offices. Since today one AP shows as "down" but I can ping it from the master controller. Tried to reboot the master and AP. In a traffic capture I have noticed no (GRE) traffic whatsoever from the AP towards the master controller. Traffic rules allowed all communication in both directions to/from AP and controller. The AP's have static IPs and the IP of the controller is also statically configured, so no ADP/DNS/DCHP whatsoever.
I'm guessing I don't have any other options than to verify this with a console cable? Or is this a remote way to access the AP?
Why could the AP lose their "master" configuration setting?