Like all other roles in Lync Server, the Director communicates to other servers in the organization using Mutual Transport Layer Security (MTLS). To leverage MTLS, the Director needs at least one certificate installed meeting a few requirements. A separate certificate can be used for each function, or a single certificate for MTLS and web services meeting the following requirements can be used:
• The subject name should contain the pool’s fully qualified domain name (FQDN).
• The server name should be included as a subject alternative name.
• If the internal or external web services FQDN differs from the pool name, it should also be included as a subject alternative name.
• All supported SIP domains must be entered ...