Event Details
User Activity->Network and Firewall Tracking->IPSec->Windows 2008->EventID 4976 - During Main Mode negotiation, IPsec received an invalid negotiation packet.
EventID 4976 - During Main Mode negotiation, IPsec received an invalid negotiation packet.
 Sample: 
        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
Log Type: Windows Event Log
 Uniquely Identified By:
Log Name: Security
Filtering Field Equals to Value
OSVersion Windows Vista (2008)
Windows 7 (2008 R2)
Windows 8 (2012)
Windows 8.1 (2012 R2)
Windows 10 (2016)
Category Logon/Logoff
Source Microsoft-Windows-Security-Auditing
TaskCategory IPsec Main Mode
EventId 4976
Field Matching
FieldDescriptionStored inSample Value
When At what date and time a user activity originated in the system. DateTime
Who Account or user name under which the activity occured. User
What The type of activity occurred (e.g. Logon, Password Changed, etc.) "IPsec Received an Invalid Negotiation Packet" IPsec Received an Invalid Negotiation Packet
Where The name of the workstation/server where the activity was logged. Computer
Where From The name of the workstation/server where the activity was initiated from. - 10.10.10.10
Severity Specify the seriousness of the event. "High" High
WhoDomain -
WhereDomain -
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