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0x800B010ASystemMedium

Error 0x800B010A — Chaining Error (CERT_E_CHAINING) | Windows System Error Fix

Windows 11Windows 10Windows Server 2022

What Does 0x800B010A Mean?

A certificate chain could not be built to a trusted root authority.

Real-World Causes

  1. 1Intermediate certificate is missing from the chain
  2. 2Server misconfigured to not send complete certificate chain
  3. 3Corporate CA chain not fully deployed
  4. 4Network proxy stripping intermediate certificates

Symptoms

  • ⚠SSL/TLS connections fail intermittently
  • ⚠Some HTTPS websites fail while others work
  • ⚠Code signing validation fails
  • ⚠VPN certificate authentication fails

DIY Fix

Beginner-friendly steps you can try at home

  1. 1Update root and intermediate certificates via Windows Update
  2. 2Check system date and time are correct
  3. 3Try accessing the resource from a different network to rule out proxy issues
  4. 4Clear the SSL state: Internet Options > Content tab > Clear SSL state

Advanced Fix

For experienced users and IT professionals

  1. 1Download and install missing intermediate certificates manually from the CA's website
  2. 2Use 'certutil -verify -urlfetch certificate.cer' to diagnose the chain issue
  3. 3Check certificate chain completeness using SSL Labs or openssl s_client

Frequently Asked Questions

What is a certificate chain?
A certificate chain connects an end-entity certificate (for a website or application) through intermediate certificates to a trusted root CA. If any link in the chain is missing or untrusted, the entire chain fails. It is like a trust hierarchy.

Related Error Codes

0x800B0109Untrusted Root (CERT_E_UNTRUSTEDROOT)0x800B0101Certificate Expired (CERT_E_EXPIRED)

About the Author

Windows Troubleshooting Team

Verified against official Microsoft documentation and real-world diagnostic data. Error behavior confirmed across Windows 10, Windows 11, and Windows Server.