When searching user accounts, the search process is either slow or it fails within Desktop Director.

In Information Server (IIS) Management and under the Desktop Director site, select Application Settings and add a new value to search the Active Directory called Connector.ActiveDirectory.ForestSearch.

By default, the value is hidden and configured as True. If you configure the value as False, Desktop Director will only search the current domain.

If the Director Server or the Administrator on the Director Server is not a member of the searchable domain, add the searchable domain or domains in the Connector.ActiveDirectory.Domains field, as displayed in the following screen shot:

Example :- 
(user),(server),abc.local,xyz.local

Problem Cause

By default, all the Global Catalogs for the Active Directory Forest is searched using Lightweight Directory Access Protocol (LDAP). In a large Active Director environment, this query can take some time or even time out.