What does Windows error code 13840 (ERROR_IPSEC_IKE_PROCESS_ERR_NOTIFY) mean?

 
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ERROR_IPSEC_IKE_PROCESS_ERR_NONCE ERROR_IPSEC_IKE_PROCESS_ERR_DELETE

ERROR_IPSEC_IKE_PROCESS_ERR_NOTIFY

ERROR_IPSEC_IKE_PROCESS_ERR_NOTIFY means an IKE notify message could not be processed. Notify payloads often carry protocol errors, lifetime information, NAT detection or other control information, so the actual meaning depends on the notify type.

What to check

  • Use a trace to identify the notify type and the IKE message in which it appeared.
  • Check for a specific IKE policy, lifetime, NAT or authentication error around the same time.
  • Compare both endpoints because the receiving side may record only this parsing error while the sender logs the original condition.

Microsoft: Use Netsh to manage network traces

Microsoft: IPsec IKE system error codes

Microsoft: Audit IPsec Main Mode


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