[This is pre-release documentation and subject to change in future releases. This topic's current status is: Milestone-Ready]

Topic Last Modified: 2010-07-18

Microsoft Communications Server 2010 requires a public key infrastructure (PKI) to support Transport Layer Security (TLS) and mutual TLS (MTLS) connections. By default, Communications Server 2010 is configured to use TLS for client-to-server connections. MTLS is used for connections between servers.

MTLS certificates must be issued by trusted certification authorities (CAs) for Communications Server. Communications Server supports certificates that are issued from the following CAs: