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WININET_E_CLIENT_AUTH_NOT_SETUP
WININET_E_CLIENT_AUTH_NOT_SETUP is a WinINet HRESULT. It means that the server requested client-certificate authentication but WinINet could not provide a usable client identity. The certificate may be missing, lack its private key, be inaccessible to the process, or not match the server requirements.
What to check
- Verify that the required client certificate is installed for the account running the application and has an accessible private key.
- Confirm that the certificate issuer, key usage and subject identity meet the server authentication policy.
- Check certificate selection and store configuration without exporting or logging private key material.
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