Symantec SSL certs not working

You may have issues with Symantec certificates, as Symantec certs had their trust revoked because of very severe mis-management of their CA certificates.

This resulted in DigiCert taking over the Symantec business, you should have gotten multiple mails on this registered email address about getting new certs. This trust revoke happened in Sept, and they had mailed people for 6 months prior to change them out freely. I am not sure if it is still free to change them but this is a very known issue.

https://www.digicert.com/replace-your-symantec-ssl-tls-certificates/