Event ID: 4976
During main mode negotiation, IPsec received an invalid negotiation packetDuring main 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: %1 Remote Network Address: %2 Keying Module Name: %3
Microsoft Documentation
Lookup Audit Policy Configuration Settings
C:\> AuditPol.exe /get /subcategory:"IPsec Main Mode"
Operating Systems:
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