Windows server 2016 UntrustedClientCertificate, Error string=Certificate Error, Response code= 401

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Looking at the documentation, I don’t have enough specific information about resolving an UntrustedClientCertificate error for the scenario you described. However, there are a few relevant points that may help troubleshoot the issue:

  1. Certificate authentication issues can be difficult to diagnose without proper logging enabled. You can enable more detailed logging by configuring the SolClient SDK logging callbacks.

  2. When using certificate authentication, you should verify:

    • Trust store path
    • Certificate path
    • Certificate password
    • SSLValidateCertificate setting
    • Host name, VPN and client name settings

  3. The version of OpenSSL libraries being used can impact certificate validation on Windows Server environments.

For more detailed troubleshooting, I recommend:

  1. Enable debug level logging to get more detailed error information
  2. Verify all certificate-related configurations
  3. Check the version compatibility between your certificates and the OpenSSL libraries

Relevant documentation: