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[Q] AUTHENTICATION_FAILED Notification

Hi,

I have a question about the usage of AUTHENTICATION_FAILED Notification 
of IKEv2.

draft-ietf-ipsec-ikev2-12.txt says:

        AUTHENTICATION_FAILED                    24
                                                                                
            Sent in the response to an IKE_AUTH message when for some
            reason the authentication failed. There is no associated
            data.
                                                                                
Is the Notify payload of this type cryptographycally protected with
IKE_SA?  

Regards,

Yoshihiro Ohba