Nov 10, 2018

Multiple Domain (UCC) SSL Certificate and Subject Alternative Names (SANs)

A Unified Communications Certificate (UCC) is an SSL certificate that secures multiple domain names and multiple host names within a domain name. A UCC lets you secure a primary domain name and up to 99 additional Subject Alternative Names (SANs) in a single certificate.

UCCs are compatible with shared hosting. However, the site seal and certificate "Issued To" information will only list the primary domain name. Please note that any secondary hosting accounts will be listed in the certificate as well, so if you do not want sites to appear 'connected' to each other, you should not use this type of certificate.

You cannot upgrade a UCC to include more names. If you bought the UCC with up to five domain names, you need to purchase a new certificate to add another domain name.

After your Multiple Domain (UCC) SSL certificate is issued, you can add or remove Subject Alternative Names (SANs) at any time. SANs are the additional, non-primary domain names secured by your UCC SSL certificate. However, keep in mind:

  • Changing your SANs generates a new certificate, which you must install on your server.
  • Your old certificate only remains valid for 72 hours.
Adding SANs generates a new certificate that you must install on your server. Your old certificate only remains valid for 72 hours. After that, your websites using the old certificate will begin generating errors.

If you want to install the UCC on multiple servers, export the private key from the original server and import it on the additional servers you want to secure. Then, install the UCC on the new servers.