Updated to 9.21.05 a few days ago and seem to be having problems with ios devices accessing the network consistently. Device and controller show connected, but I cannot access the internet or ping the default gateway. Toggle wifi on the device on/off and it immediately picks back up. Or if you wait long enough 10+ minutes, you will eventually get re-authed and things start working. SSID is using 802.1x and the issue is somewhat inconsistent, but seems to occur most often when roaming.
Help ? Anyone see anything similar, hopefully a solution or have to revert back before students return.