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ERROR_IPSEC_IKE_PROCESS_ERR_NATOA
NAT-OA processing failed during NAT traversal negotiation
NAT traversal for IKEv1 defines NAT discovery and NAT original-address payloads so peers can account for address translation when negotiating transport-mode protection. This status identifies failure while processing a NAT-OA payload, not a generic inability to reach a peer through NAT.
Inspect whether NAT-T was negotiated, which side is behind translation, and whether the NAT-OA payload is structurally and semantically consistent with the exchange. Multiple layers of NAT, vendor-specific behavior, or stale state after address translation changes can cause the original-address information to disagree with the current SA context.
What to inspect
- Capture the NAT-D and NAT-OA payload sequence and the outer UDP addresses.
- Check whether the NAT mapping changed between Main Mode and Quick Mode.
- Do not solve a payload-processing error by opening unrelated firewall ports; first verify the NAT-T exchange itself.
References
- IETF RFC 3947: NAT traversal in IKE
- Microsoft Open Specifications: MS-IKEE index
- Microsoft Open Specifications: MS-IKEE product behavior
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