Currently, the mgmt server can work only with LDAP, not LDAP using TLS.
So update the UI to permit to use LDAPS (the port must be 636 and the server name must begining by "ldaps://"). We need also to add a field that contains the certificate path. We can also force the session to proceed even if the certificate is missing or wrong by setting TLS_REQCERT ALLOW in /etc/ldap/ldap.conf (see https://linux.die.net/man/5/ldap.conf and https://my.vertica.com/docs/7.1.x/HTML/Content/Authoring/AdministratorsGuide/Security/ClientAuth/UsingLDAPOverSSLAndTLS.htm).
Reload of apache2 is required after updating the file.