Issue on Upgrading LDAP Authentication Module 2.1.5 to 2.1.6

I’ve just upgraded my LDAP authentication module from 2.1.5 to 2.1.6 and in log window, I observed a strange behavior of the said app. Before, upgrading to 2.1.6, auth_ldap can get information only in {ldap_servers}, but in my current version ejab start contacting sub domain controllers which makes nearly DOS. Besides, whenever a user tries to log-in, ejab starts connecting to all DC controller, including no defined domains, even if they’re restricted to managing sub domains only. If you have more than 20 DC with weak support system and X000 users logging in at the same time, this will definitely create a big mess. Can anyone teach me how to force ejab to make authentications via defined LDAP servers? Thanks a bunch in advance.
