Set the MaxPageSize in Active Directory

In large environments there are lots of objects in Active Directory. Querying the objects via LDAP is done by different third party applications to (for example) verify users. But sometimes these queries return an error with regard to the sizelimit and not all objects are returned.
 You can change this limit with the ADSI Edit Snap-in. 

CN=Default Query Policy, CN=Query-Policies, CN=Directory Service, CN=Windows NT, CN=Services, CN=Configuration, DC=YOUR_COMPANY, DC=YOUR_COMPANY_TLD

Doubleclick on the lDapAdminLimits. Click on MaxPageSize and remove the entry. Change the entry as shown next :
MaxPageSize=10000