How to secure communication using 3rd party SSL certificates?

Endpoint 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 Endpoint Central server. To make Endpoint 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 Endpoint Central host. 

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