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