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STATUS_IPSEC_DOSP_INVALID_PACKET
The packet was rejected before negotiation state could be trusted
STATUS_IPSEC_DOSP_INVALID_PACKET indicates that IPsec DoS protection received an incorrectly formatted packet in the protected negotiation path. This is not the same as a normal authentication failure: it points to syntax or layout that could not be accepted safely enough to create or use the expected state.
Keep packet evidence and compare it with the negotiated keying method and expected encapsulation. Repeated events may come from a misconfigured peer, a middlebox that changes packets, stale traffic from an old implementation, or hostile input. The status alone does not identify which one, so packet context and the active policy are required.
What to verify
- Preserve a bounded packet capture and relevant IKE/AuthIP/WFP events.
- Check the protocol and keying-module path expected by policy.
- Compare peer version and NAT traversal settings before changing cryptographic policy.
- Treat malformed negotiation traffic as untrusted even when it originates from an expected address.
References
- Microsoft Open Specifications: NTSTATUS values
- Microsoft: configuring IPsec with WFP
- RFC 7296: IKEv2 and Security Association lifetimes
- RFC 4301: Security Architecture for IP
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