What is Microsoft Certificate Authority Server?

Microsoft Certificate Authority (CA) is part of the Windows Server operating system. A certification authority (CA) is responsible for attesting to the identity of users, computers, and organizations. The CA authenticates an entity and vouches for that identity by issuing a digitally signed certificate. The CA can also manage, revoke, and renew certificates.

Whenever a user requests to access a virtual environment, the front end servers contact the Federated Authentication Service (FAS) in the environment. The FAS, in conjunction with Microsoft Certification Authority, grants a ticket that allows a single session to authenticate with a certificate for that session.