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| ERROR_IPSEC_REPLAY_CHECK_FAILED | ERROR_IPSEC_INTEGRITY_CHECK_FAILED |
ERROR_IPSEC_INVALID_PACKET
The packet cannot be parsed as a valid protected IPsec packet
ESP defines a precise packet format containing SPI, sequence number, payload data, padding, pad length, next-header information, and optional integrity data. This status means Windows found an invalid IPsec header or trailer before normal protected-payload processing could complete.
Packet corruption is one possibility, but malformed encapsulation, wrong protocol demultiplexing, truncation, or a device modifying protected bytes can also produce structural failure. Compare the packet length and ESP fields with RFC 4303 and determine whether the failure occurs before or after NAT traversal decapsulation.
What to inspect
- Capture the failing packet as close to the receiver as possible.
- Verify ESP packet length, trailer fields, and encapsulation boundaries.
- Check MTU, fragmentation, and middleboxes only with packet evidence showing truncation or modification.
References
- IETF RFC 4303: Encapsulating Security Payload
- IETF RFC 4301: IPsec security architecture
- Microsoft: Windows Filtering Platform API sets
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