Most likely, you are running into this limit: (From MS KB 315071):
MaxValRange - This value controls the number of values that are returned for an attribute of an object, independent of how many attributes that object has, or of how many objects were in the search result. In Windows 2000, this control is "hard" coded at 1,000. If an attribute has more than the number of values that are specified by the MaxValRange value, you must use value range controls in LDAP to retrieve values that exceed the MaxValRange value. MaxValueRange controls the number of values that are returned on a single attribute on a single object.

Default value:

You will probably need to fix it in AD, using ntdsutil.

            "XML is like violence: if it doesn't solve your problem, use more."

In reply to Re: Net::LDAP retrieval of Active Directory group members (multi-valued attributes that exceed the server side limit.) by NetWallah
in thread Net::LDAP retrieval of Active Directory group members (multi-valued attributes that exceed the server side limit.) by tymm654

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