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Event ID 4978: During extended mode negotiation, IPsec received an invalid negotiation packet

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During extended mode negotiation, IPsec received an invalid negotiation packet.

Event 4978
Security-Auditing
Security log
Audit
Message and fields (as Event Viewer shows them) 
During extended mode negotiation, IPsec received an invalid negotiation packet. If this problem persists, it could indicate a network issue or an attempt to modify or replay this negotiation.

Local Network Address:	…
Remote Network Address:	…
Keying Module Name:	…