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ERROR_IPSEC_IKE_PROCESS_ERR_NONCE
ERROR_IPSEC_IKE_PROCESS_ERR_NONCE means an IKE nonce value could not be parsed or accepted. Nonces are random values used to bind and protect the negotiation, so malformed nonce data indicates a protocol or peer implementation issue.
A nonce-processing failure is protocol evidence, so preserve the original exchange. Recreating certificates or changing firewall rules is unlikely to help unless another error shows that authentication or packet delivery failed first.
What to check
- Capture the IKE exchange to inspect the nonce payload and identify the transmitting peer.
- Check for a peer software or firmware compatibility issue rather than changing certificate configuration.
- Verify the exchange is not being redirected to a different endpoint or VPN implementation.
Microsoft: Use Netsh to manage network traces
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