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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.
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
Microsoft: IPsec IKE system error codes
Microsoft: Audit IPsec Main Mode
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