Error: 8024B303 - Updates Not Trusted on Endpoints During Installation

Error: 8024B303 - Updates Not Trusted on Endpoints During Installation

Symptom

Updates deployed to endpoints through Configuration Manager fail with an error code of 0x8024B303 and/or an error message of "The subject is not trusted for the specific action".

Cause

The certificate signing the updates is not present in the client certificate store.

Solution

Distribute and import the certificate used to sign the updates into the following certificate stores on the endpoints:

  • Trusted Root Certification Authorities
  • Trusted Publishers