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ERROR_IPSEC_IKE_PROCESS_ERR_SIG
ERROR_IPSEC_IKE_PROCESS_ERR_SIG means the signature payload in the IKE exchange could not be parsed or used. This differs from a simple signature-verification failure because the payload itself may be malformed or unsupported.
What to check
- Check the peer certificate, signature algorithm and IKE version in the packet capture.
- Compare supported cryptographic algorithms with the effective policy.
- Review related certificate payload and invalid-signature events for the same SA.
Microsoft: Use Netsh to manage network traces
Microsoft: IKE/AuthIP authentication methods
Microsoft: IPsec IKE system error codes
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