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ERROR_IPSEC_IKE_NO_PUBLIC_KEY
ERROR_IPSEC_IKE_NO_PUBLIC_KEY means Windows received a peer certificate that did not contain a usable public key for the selected IKE authentication path.
What to check
- Inspect the peer certificate rather than only the local certificate store.
- Verify the peer uses the correct certificate template and did not send an incomplete or unsuitable certificate.
- Check for related certificate-type, key-usage or signature failures in the same negotiation.
Microsoft: IKE/AuthIP authentication methods
Microsoft: IPsec IKE system error codes
Microsoft: Audit IPsec Main Mode
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