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Knowledgebase: SSL.com Certificates
What is a Multi Domain (UCC) SSL Certificate?
Posted by Leonard Grove on 24 October 2012 04:30 PM

Multi-domain SSL Certificates, commonly referred to as Unified Communications Certificates or UCC, are certificates that secure multiple domains and multiple hostnames within a single ssl certificate. UC Certificates are ideal for Microsoft® Exchange Server 2007, Exchange Server 2010, and Microsoft Live® Communications Server because they allow you to secure a primary domain, and up to 99 additional Subject Alternative Names (SAN), in a single UC Certificate.

UCC certs allow you to use a single ssl certificate in a shared host environment so they are also ideal in situations where the number of ip addresses are limited such as in a cloud presence (for example Amazon EC2 or Rackspace cloud). For instance, if you have 10 sites with differing domains or host names, and only one ip address to use among them and you want them to have ssl digital certificate protection, then a multi domain ucc ssl certificate is ideal for this situation.

In a shared hosting environment, the UC Certificate "Issued To" will only list the primary domain (but the site seal can list the remaining domains in the SAN). Please be aware that any other or secondary domains will be listed in the UCC SSL certificate as well. If you do not want domains or sites to appear related to each other via the ssl certificate details, then this is something that you should factor in when ordering a multi domain ssl certificate.

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