The problem is that one of the clients loses the connection to the network time to time
The error in the WLC logg is
*Dot1x_NW_MsgTask_0: Jul 06 17:42:38.934: %DOT1X-3-INVALID_WPA_KEY_MSG_STATE: 1x_eapkey.c:843 Received EAPOL-key M2 msg has invalid information when mobile is in START state - invalid secure bit; KeyLen 24, Key type 1, client 00:21:6a:af:be:70
First it was happening with just one client but khow more clients are facing the same problem
*Dot1x_NW_MsgTask_0: Jul 09 12:29:24.792: %DOT1X-3-INVALID_WPA_KEY_MSG_STATE: 1x_eapkey.c:843 Received EAPOL-key M2 msg has invalid information when mobile is in START state - invalid secure bit; KeyLen 24, Key type 1, client 00:26:c7:f2:67:68
If this is happening with one particular client only, if the client works fine for a while but then it fails and if the issue happens even if you have other wireless clients connected to the same access point the it is most likely to be an issue with the client itself so you may need to verify the firmware of the computer itself, try to do an update to avoid compatibility issues and if it does not connect at all then you may need to double check the client’s configuration.
If the issue continues, you may need to contact wireless client’s manufacturer for support.
This is usually happens with old drivers for computers or with wireless devices (wireless scanners, wireless priners...etc). Usually - just like everyone else suggested - the fix is to upgrade the driver or the firmware of your device. It is a client compatibility issue most of the time. Updating the firmware/driver usually fixes such issues.
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Transferring Crash file from standby: Login to the Active WLC in HA.
From CLI: (Cisco Controller) >transfer upload datatype crash (Cisco
Controller) >transfer upload filename (Cisco
Controller) >transfer upload mode tftp (Cisco Controller) >transfer
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