Event ID: 4976

During main mode negotiation, IPsec received an invalid negotiation packet 

During 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

Event ID - 4976


Lookup Audit Policy Configuration Settings

C:\> AuditPol.exe /get /subcategory:"IPsec Main Mode"
How to enable Windows Auditing
Recommended Audit Policy

Operating Systems:
Windows Vista Windows 2008 Windows 2008 R2 Windows 7 Windows 2012 Windows 2012 R2 Windows 8 Windows 8.1 Windows 10 Windows 2016 Windows 2019

Tags:
Audit Success
Audit Category:
Logon/Logoff

Audit Subcategory:
IPsec Main Mode

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