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I'm running 7.5 on a 2504 and keep getting
Dot1x_NW_MsgTask_6: Nov 26 20:06:04.287: #DOT1X-3-CLIENT_NOT_FOUND: dot1x_msg_task.c:1519 Unable to process 802.1X 2 msg - client 00:19:aa:d7:e9:8e not found
in the log on the controller.
There is just one controller on the network.
I noticed that the mac address corresponds to the mac address of the BIA under the mobility set up.
I cannot find anything relevant on the internet or Cisco's web site.