Yes, ADManager Plus supports LDAP SSL protocol. You can configure it by following these steps,

1. Navigate to the Admin tab.
2. Under General Settings, click Connection.
3. Enter the Port number.
4. Select the Enable LDAP SSL for option to use LDAPS to connect to your Active Directory.

   Note: Before enabling LDAP SSL in ADManager Plus, ensure that you have enabled LDAP SSL in your Active Directory environment.

5. Click Save Changes.