I have 6 Cisco 1130AG access points. They were all working fine until about 2 weeks ago and they all started to give the following error messages:
Feb 23 17:03:13.241 Information Interface Dot11Radio0, Station ap1 0019.d206.2adf Associated KEY_MGMT[NONE]
Feb 23 17:03:11.200 Information Interface Dot11Radio0, Deauthenticating Station 0019.d206.2adf Reason: Sending station has left the BSS
Feb 23 17:00:15.293 Warning Possible encryption key mismatch between interface Dot11Radio0 and station 0019.d206.2adf
Feb 23 17:00:11.071 Information Interface Dot11Radio0, Station ap1 0019.d206.2adf Associated KEY_MGMT[NONE]
Feb 23 17:00:07.188 Information Interface Dot11Radio0, Deauthenticating Station 0019.d206.2adf Reason: Sending station has left the BSS
Feb 23 16:59:57.492 Information Interface Dot11Radio0, Deauthenticating Station 0016.6fca.e4e1 Reason: Previous authentication no longer valid
I have looked on multiple sites and forums and they guess that it comes down to a hardware or a signal interference problem. The computers will connect to the wireless network for about 30 minutes and then drop the network resources. It will stay connected to the actual wireless network which leads me to believe that it is not hardware or interference but the actual authentication with Active Directory. I had them set up on WEP keys initially but I set up a test network with WPA to test that out but they couldn't authenticate the user, so the clients never connected.
I have updated the firmware, synced the time, deleted and reconfigured the WLANs with various authentication methods, and have completely reset the APs but none of that helped.