We're running 8.1.0.4 (due to the fact that we have several AP93) - and suddenly out guest network stopped working. They cannot obtain IP-address.
Users on our backup 3400 controller running 6.1 AOS using the same VLAN and DHCP works so I can hardly see this as a network related problem.
This is what I pick up from the logs:
Feb 23 14:00:43 stm[2404]: <501053> <2404> <ERRS> |stm| Station 50:f5:20:b9:a3:45: STA UP sent to wrong UAC for essid GUEST
rebooted one of the controller and now it seems to work for that controller.
Bridged clients still work OK.