0x800B0109 | Certificate chain not trusted

Industry

Systems & Devices

Canonical

/systems/security-systems/error-codes/0x800b0109/

Last Updated

Feb 27, 2026

Summary

Windows could not validate a certificate chain to a trusted root authority.

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What This Code Means

0x800B0109 indicates a certificate validation failure where the certificate chain cannot be built to a trusted root. It often appears in TLS connections, code signing checks, and install/update scenarios that require trusted certificates.

Where Users Usually See This Code

Application install/update validation
TLS/SSL connection errors in Windows components
Smart card/certificate enrollment flows

Why This Code Appears

Missing trusted root certificate in the system store
Intercepting proxy replaces certificates (enterprise TLS inspection)
System time is incorrect, breaking certificate validation

What Typically Happens Next

The secure connection or validation step fails

What This Code Is Not

It is not a username/password error
It is not a “network is down” indicator by itself

Troubleshooting Checklist

□ Verify system date/time
□ Confirm the issuing CA is trusted on the machine (managed environments may use enterprise roots)
□ Review whether a proxy/security product is intercepting TLS and ensure it is properly configured

Notes And Edge Cases

Do not bypass certificate validation in production systems; fix trust configuration instead.

Related Codes

8 links

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