How to Investigate Website Errors After a Certificate Authority Chain Update

A changed certificate chain can affect older clients or intermediate proxies even when the leaf certificate is valid.

Checks to make

Inspect the served chain from affected and working clients, compare trust stores and TLS errors, and check recent certificate automation changes. Verify the full chain at the origin and edge before changing protocols or replacing certificates.

When to get help

Hosting support can review TLS chain delivery across web layers. Informatix Systems can assess the symptoms, evidence, and next steps. Contact Informatix Systems to discuss this issue.