A Certificate Authority (CA)-signed certificate provides more security than a self-signed certificate and is appropriate for HTTPS and SMTP/TLS communication. Before you proceed, determine the CA from which you want to purchase your certificate. Some possible CAs to use are listed on the Certificate Authority tab in the Control Center. However, other CAs are also supported.
For the common name, use the domain name or the fully qualified domain name of the computer where the certificate will be installed. Some CAs may not support certificates that are created using an IP address instead of a domain name for the common name. Check with your CAs.
See About certificates.
To request a Certificate Authority-signed HTTPS or TLS certificate