Event ID 4976 – During Main Mode negotiation, IPsec received an invalid negotiation packet.
|Sub-Category||Audit IPsec Main Mode|
|Description||During a Main Mode negotiation, IPsec received an invalid negotiation packet.|
If IPsec receives an invalid negotiation packet, event 4976 is generated. If there is a repetition of this problem, it could indicate either a network issue or an attempt to modify and replay the negotiation.
Example of 4976 log:
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
Why does event ID 4976 need to be monitored?
Security events which fall under the Audit IPsec Main Mode subcategory are monitored primarily for IPsec Main Mode troubleshooting.
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Event 4976 applies to the following operating systems:
- Windows 10
- Windows Server 2016