We just upgraded to software version 18.104.22.168 and some users are experiencing very long delays during authentication. We use 8021x with RADIUS authentication. When they log into the computer, it hangs for about 60 seconds after entering the password. After that it will hang at the "applying computer settings" screen for anywhere from 10 minutes to forever. This does not happen if the computer is plugged into the wired network. It's random. I can move the AP's to the other controller and it will work for a day or two and then start acting up again. I move them back to the primary controller and it is ok for a day or two. I can't seem to figure this out so I thought I'd get some input from you guys since you have always been a great deal of help.
EDIT: after the upgrade we have been receiving TONS of MFP anomally detections and Broadcast Deauth events......could this be related?
In the Security tab under Wireless Protection Policies | AP Authentication / MFP, Protection Type set to none for now. How do you have your WLC setup... primary and backup or are the two spliting the load? What radius server are you running and how many? What do you see in the logs in the radius server?