Meru Technical Note - What does 'Replay Counter Mismatch' means in station-log?
What does “Replay Counter Mismatch” means in station-log?
Scope
KB Article Type: Design
Related Products: Controller, AP
Related Software Versions: Any
Keywords: Replay Counter Mismatch, station-log
Solution
2013-05-23 11:13:24.903 | 88:53:2e:27:33:a5 | 1X Authentication | Replay Counter Mismatch
2013-05-23 11:13:24.907 | 88:53:2e:27:33:a5 | 1X Authentication | Replay Counter Mismatch
The above error comes up, when the AP transmits a key to a station; it expects a response back within certain duration (1000ms as per the standard). If the station does not respond, the AP increments the counter and retransmits a new key. If the AP receives a response to first key message just after the retransmission of the new key, a mismatch occurs in the counter.
Another reason, could be that key received by the AP but processed very late (after a new key retired from the client) resulting replay counter mismatch.