Certificates are issued for a specific usage – as an example, CA certificates can be used to sign certificates but your web site certificate can not be used that way – it’s only valid for servers.
A certificate includes settings that indicates usage. There are settings for e-mail security, electronic signatures, SIP IP Telephnoy and many other applications. A web site certificate should be valid for securing web sites.
This server presents a certificate that is not valid for web site security. A client using HTTP should not be able to connect to this server.