I recently encountered this problem with a new installation that was done at a customer. There are two 4402 wlc and 1141n waps. Radius server IAS 2003 is used.
At first every 1/2 hr or so the connection would re-authenticate and the users would loose connection to remote software however after a couple of days the connection started doing this for every ten minutes. When i checked the session timeout set on the wlc it was set for half hour and when i did a debug on the client and show detail on the mac the info showed that re-auth timer plus the connection timer was set to 10minutes. Only after I manually disconnected the session and re-connected then the re-auth timers went to the 1/2 hr set. Any ideas why this might be happening.
I disabled the session timeout which sets the re-auth for 24hrs but again when i checked the reauth is counting down once the client remains connected. When the client goes on standby and reconnects the re-authen timer is decreased so I am not sure if this is counting down once the connection is not manually disconnected.
I just want to have a better idea how it works because the customer is due to go into production from next week.
Also everytime the connects de-auth-re-auth the event viewer for the IAS server shows an ldap connection established and all clients connected.