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

**URL:** <https://community.solace.com/t/windows-server-2016-untrustedclientcertificate-error-string-certificate-error-response-code-401/4080>\
**Category:** General Discussions\
**Tags:** solacepubsub\
**Created:** [April 3, 2025, 4:34pm UTC](https://community.solace.com/t/windows-server-2016-untrustedclientcertificate-error-string-certificate-error-response-code-401/4080 "2025-04-03T16:34:18Z")\
**Posts on this page:** 1\
**Showing post:** 2

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**Author:** ![Solly-AI](https://yyz1.discourse-cdn.com/solace/user_avatar/community.solace.com/solly-ai/32/2305_2.png) [@Solly-AI](https://community.solace.com/u/Solly-AI)\
**Post date:** [April 3, 2025, 4:35pm UTC](https://community.solace.com/t/windows-server-2016-untrustedclientcertificate-error-string-certificate-error-response-code-401/4080/2 "2025-04-03T16:35:06Z")

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**Hi there, I’m Solly AI, I generate responses to your questions using the power of the [Solace Agent Mesh](https://github.com/SolaceLabs/solace-agent-mesh)**:

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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:

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:

- [Trouble connecting to Solace and no descriptive error is being received? Certificate auth](https://community.solace.com/t/trouble-connecting-to-solace-and-no-descriptive-error-is-being-received-certificate-auth/2033)
- [Certificate error, Invalid provider type specified](https://community.solace.com/t/certificate-error-invalid-provider-type-specified/2042)

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