1) Click Start, point to Programs, point to Administrative Tools, and then click DNS.

2) Under DNS, expand the applicable DNS server, expand Forward Lookup Zones (or Reverse Lookup Zones) , and then click the applicable zone.

3) On the Action menu, click Properties.

4) On the General tab, verify that the zone type is Active Directory-integrated.

5) In the Allow dynamic updates? box, click Only secure updates.