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If you set the "User Base DN" to your LDAP Root DN, it means that the search will start from the Root DN until it finds all the results that matched the search filter.

So, setting the "User Base DN" precisely is very important as it will decide where the search is starting from. It will save all the unnecessary search between the Root DN to your "User Base DN".

DC=joget,DC=org

DC=HR,DC=joget,DC=org
DC=Product Department,DC=joget,DC=org
DC=Operation,DC=joget,DC=org
DC=Users,DC=joget,DC=org

If your users are all under "DC=Users,DC=joget,DC=org", you should set this to "User Base DN".

(&(objectClass=person)(|(cn=admin)(cn=cat)(cn=jack)(cn=john)(cn=jackie)))

This mean all the LDAP entries which have "objectClass" attribute equals to "person" and "cn" attribute equals to either "admin", "cat", "jack", "john" or "jackie" are Joget users.

So, when a login is performed by "admin", the search filter will add additional filter and become "(&(&(objectClass=person)(|(cn=admin)(cn=cat)(cn=jack)(cn=john)(cn=jackie)))(cn=admin))". 

You will notice an extra (cn=admin) is added to the search filter to make sure it return only the "admin" user.

The Debug Mode is highly recommended to be turned on when configuring the LDAP plugin for the first time.
When debug mode is on, you can find all the search queries performed by the directory manager. They will all be logged into the log file. From there, you can observe the search filter string and improve the accuracy and performance of the lookup.