How to secure communication using 3rd party SSL certificates?

Desktop Central can run as a HTTPS service. But it is also recommended to hold a SSL (Secure Socket Layer) Certificate signed by a valid Certificate Authority (CA) to secure communication with the DC server. To make Desktop Central server identify itself correctly to the web browser and the user, you need to obtain a new signed certificate from a CA for the Desktop Central host. 

Refer here for the steps to create/renew and upload 3rd Party Certificates.