Event ID - 544

Event Id544
DescriptionIKE security association establishment failed because peer could not authenticate. The certificate trust could not be established.
Peer Identity:
Event InformationAccording to Microsoft :
Cause :
This event might have occurred because IP Security could not validate the trust for the peer’s certificate.

Resolution :
Check thePeer Identity field to determine if the root certificate listed should be trusted. If the root certificate can be trusted, make sure there is a copy of the root certificate in the root machine certificate store, and intermediate chain certificates in the CA machine store. Finally, make sure that your IPsec policy allows that root certificate to be used when talking with this peer.
Reference LinksEvent ID 544 from Source Security

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