Installing Third-Party Certificate for SEPM 12.1 web console

I am looking for help on enabling SSL with third party certificate from a trusted CA for the symantec web console.
I've followed the steps describe here : https://www-secure.symantec.com/connect/forums/ins...
It's kinda of working : the server respond well on the 443 ssl port, the certificate is the new trusted one. But on the 8443 port, the port that is used by the web console, it's the original auto signed symantec certificate that is still in use. The one that is refused by the web brower...

I'm not searching to know how to install the auto signed cerificate on the browser, i'm really searching to install a "true" cerificate on the server
Any help would be welcome :)