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User receives the error message "Invalid message authenticator in EAP request" in Access point.
The shared secret is not entered correctly in either the access point or the RADIUS server.
When you receive the Bad request from NAS error message and the Invalid message authenticator in EAP request failure code, then you need to check and re-enter the shared secret key in the access point and the RADIUS server.
A RADIUS server and the access point use a shared secret text string to encrypt passwords and exchange responses. In order to configure RADIUS to use the AAA security commands, you must specify the host running the RADIUS server daemon and a secret text (key) string that it shares with the access point.