LDAP connections can be established in an SSL session. This ensures data that is sent between the LDAP client (Jamf Pro) and the LDAP server is encrypted. LDAP server connections over SSL use the communication port TCP 636 by default. Custom LDAP server configuration can use other ports. A successful connection requires that the LDAP server is configured to issue the server certificate when a client requests an SSL connection, and the client needs to be configured with the trusted root certificate of the CA that issued the server certificate. When configuring Jamf Pro to use the secure LDAP connections, ensure that the fully qualified domain name or URL of your authentication server (the server you are trying to make the connection to) matches the Common Name (CN) or the Subject Field Alternative Name (SAN).