Product and Software: This article applies to all Aruba controllers and ArubaOS versions.
Mar 15 05:07:28 :501068: <WARN> |stm| Source: 00:22:fb:40:a4:84 Failed AP 10.7.56.176-00:1a:1e:f1:f9:00-wp05wap3 Multicast Encryption Mismatch
This error means that a user has entered the wrong preshared key for a WPA or WPA2 preshared key network, or it could be a driver-related issue.
If you are seeing this message, the client with the WLAN MAC address mentioned as source (in this case, 00:22:fb:40:a4:84) is trying to associate with an incorrect preshared key or is having a driver-related issue.
Further isolation can be done by rechecking the key and also by connecting from a client with different driver or chipset.