Installing SSL Certificate - Support for SHA2?

Hello, we are trying to install a SHA2 SSL certificate using the server certificate administration on our Lotus Domino server but are getting an error that the “certificate signature does not match contents.” We are thinking this might be related to the certificate being SHA2. We are running Domino 8.5.2. Is SHA2 not supported on this version or is there a patch we can install so it is supported? Thank you.

Subject: Did a google and think you need 8.5.3