This usually means that the CA that signed the certificate isn’t trusted by the browser/the operating system. This usually means that it’s a self-signed certificate.
Another possibility is that it is one from one of the official CAs, but that it wasn’t signed by the CA itself but by an intermediate.
Why don’t you tell us more about what exactly you’re doing?
[ul][li]What does “run a check” mean? Did you execute some command, if so, what was that command (including all options)?[/li]
[li]What is the certificate you’ve tried to install? Post the output of “openssl x509 -in <yourCertFileName.pem> -noout -text” here.[/li]
[li]Have you restarted all Zarafa services as well as the web server process after the installation of the certificate?[/li][/ul]
mosu