12953 Received EAP packet from the middle of conversation that contains a session on this PSN that does not exist

[Shayan.Sharif1]

NAD : WLC 5500 series Wireless controllers

Running ISE 2.4 with PATCH 11 still seeing this error : 

Event : 5400 Authentication failed

Failure Reason: 12953 Received EAP packet from the middle of conversation that contains a session on this PSN that does not exist

Resolution

Verify known NAD issues and published bugs. Verify NAD configuration. Turn debug log on DEBUG level to troubleshoot the problem.

Root cause

Session was not found on this PSN. Possible unexpected NAD behavior. Session belongs to this PSN according to hostname but may has already been reaped by timeout. This packet arrived too late.

[marce1000]

 - Could still be an additional bug ; 1) increase patch level if there are additional patches available 2) make sure this is not due to a load-balancer 3) Re-start the PSN at an idle-moment , if at all available or a 'quite traffic moment'.

 M.