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UCC SSL Certificates

A Unified Communications Certificate (UCC) is a type of multi domain SSL certificate. A UCC lists a main Fully Qualified Domain Name (FQDN) for the certificate, with every additional domain is listed as a subjectAltName (SAN). This is different from a true multi domain certificate, where every single domain is listed as a subjectAltName (SAN) and there is no main domain name.

Why purchase a UCC SSL Certificate?

It is this distinction that makes a UCC compatible with Microsoft Exchange Server, Live Communications Server and Microsoft Office Communications Server environments. Both servers can have several functions – both internal and external – assigned to different subdomains, all of which can be on a single IP address. The device will look for the main domain name on the certificate, and then look for the appended subdomains. A true multi domain certificate is not able to be used as there is no main domain name to look for on the certificate, it displays each domain as a SAN on the certificate with no main domain name.

A UCC certificate can also be used for payment gateways, Android devices, Skype servers however is most commonly used for autodiscover, which does not work with the other SSL/TLS products without significant workarounds which are both time consuming as well as potentially problematic. Autodiscover is commonly used in the Exchange platform as it greatly eases administration.


Updated on July 25, 2019

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