Windows Security Log Event ID 4961

Operating Systems Windows 2008 R2 and 7
Windows 2012 R2 and 8.1
Windows 2016 and 10
Windows Server 2019 and 2022
 • Subcategory
 • Subcategory could not be determined
Type Success
Corresponding events
in Windows 2003
and before

4961: IPsec dropped an inbound packet that failed a replay check

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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 4961

IPsec dropped an inbound packet that failed a replay check. If this problem persists, it could indicate a replay attack against this computer.

Remote Network Address: %1
Inbound SA SPI:  %2

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