What does Windows error code 13826 (ERROR_IPSEC_IKE_INVALID_SIGNATURE) mean?

 
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ERROR_IPSEC_IKE_NO_POLICY ERROR_IPSEC_IKE_KERBEROS_ERROR

ERROR_IPSEC_IKE_INVALID_SIGNATURE

ERROR_IPSEC_IKE_INVALID_SIGNATURE means the signature used to authenticate an IKE exchange could not be verified. This can result from an invalid certificate chain, wrong public key, altered handshake data, or incompatible signature algorithms.

What to check

  • Validate the peer certificate chain and ensure the public key corresponds to the certificate presented.
  • Check for a preceding revocation, certificate-type, or hash-related error.
  • Capture the negotiation on both sides before assuming a network corruption issue.

Microsoft: IKE/AuthIP authentication methods

Microsoft: Use Netsh to manage network traces

Microsoft: IPsec IKE system error codes


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