What does Windows error code 13824 (ERROR_IPSEC_IKE_INVALID_HEADER) mean?

 
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ERROR_IPSEC_IKE_CRITICAL_PAYLOAD_NOT_RECOGNIZED ERROR_IPSEC_IKE_NO_POLICY

ERROR_IPSEC_IKE_INVALID_HEADER

ERROR_IPSEC_IKE_INVALID_HEADER means the IKE packet header was malformed or inconsistent with the active negotiation. This is a protocol-level failure, so a packet capture is more useful than changing certificate settings.

What to check for ERROR_IPSEC_IKE_INVALID_HEADER

  • Capture the failing packet and verify the IKE version, initiator/responder cookies, exchange type and message length.
  • Check whether a middlebox, NAT, or VPN gateway is modifying or misrouting IKE traffic.
  • Confirm the peer address really belongs to the expected VPN/IPsec endpoint.
REM Diagnostic context: ERROR_IPSEC_IKE_INVALID_HEADER
netsh trace start scenario=NetConnection capture=yes tracefile=C:\Temp\ipsec.etl
... reproduce the failure ...
netsh trace stop

This result reference: Microsoft: Use Netsh to manage network traces.

This result reference: Microsoft: IPsec IKE system error codes.

This result reference: Microsoft: Audit IPsec Main Mode.

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