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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 stopERROR_IPSEC_IKE_INVALID_HEADER reference: Microsoft: Use Netsh to manage network traces.
ERROR_IPSEC_IKE_INVALID_HEADER reference: Microsoft: IPsec IKE system error codes.
ERROR_IPSEC_IKE_INVALID_HEADER reference: Microsoft: Audit IPsec Main Mode.
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