Windows Security Log Event ID 4978

Operating Systems Windows 2008 R2 and 7
Windows 2012 R2 and 8.1
Windows 2016 and 10
Windows Server 2019 and 2022
Category
 • Subcategory		Logon/Logoff
 • IPsec Extended Mode
Type Success
Corresponding events
in Windows 2003
and before		  

4978: During Extended Mode negotiation, IPsec received an invalid negotiation packet.

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I haven't been able to produce this event. Have you? If so, please start a discussion (see above) and post a sample along with any comments you may have! Don't forget to sanitize any private information.

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Examples of 4978

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: %1
Remote Network Address: %2

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