DreamHost / Comodo SSL Certificate "Signed by an unknown authority"

I’m running Mac OS X Server on 10.10 and using a DreamHost (Comodo) SSL certificate on it to secure various services.

This morning I’m getting warnings on all my clients that the certificate is invalid as it is “Signed by an unknown authority”. I’ve been using this certificate for months without problem.

  • The certificate is not expired
  • When I imported the certificate to OS X Server App, I imported all three parts (Private key, certificate, and intermediate).

Anyone else seeing this?
Update: I have no idea why this started this morning, but the solution was to add the Comodo Root certificate to my intermediate certificate chain. After I did this, the errors went away.

You can download the file here: https://support.comodo.com/index.php?/Default/Knowledgebase/Article/View/917/0/root-addtrust-external-ca-root

Soylent good to see it was resolved