I installed Joomla! Toolkit which runs a health check and indicated the following error on my domain which uses custom domain CF SSL and CF Origin SSL.
“Error in cURL request: Peer’s certificate issuer has been marked as not trusted by the user.”
Other domains that use Let’s Encrypt past the test as good.
I’m looking for confirmation this error was caused by the CF Origin self-signed cert which the local script was obviously pulling from to check. Reverting back to Let’s Encrypt resolved the issue.
If this is accurate, it would also explain the same error WordPress users are getting with the WorldPress Toolkit script.