In most cases, computers connect to the first available Active Directory domain controller and it is not necessary to specify the master domain controller to use for a zone. In some cases, however, you might want to identify a specific domain controller to use for a zone to prevent connections from other domain controllers from adding or removing users and groups in that zone.
To prevent connections from other domain controllers, you can set the Master domain controller field to the fully-qualified name of the domain controller you want to use. After you identify a master domain controller, administrators who connect to the zone using any other domain controller will not be able to make changes to the zone.
If you have multiple administrators managing any zones, you should notify them before setting or changing the master domain controller. You should also make this change while all other administrators are logged off. Depending how long it takes for replication to complete for all of the domain controllers in the Active Directory forest, you might want to schedule this change for a time when no administrators need access to zone information.
To change the master domain controller
- Open Access Manager.
Expand Zones and the individual parent or child zones, as required, to locate and select the zone name for which you want to change the master domain controller.
You can use Shift-Click or Ctrl-Click to select multiple zone names.
- Right-click, then click Change Master Domain Controller.
- Type the fully-qualified domain name for the new domain controller, then click OK.
- Click Yes to confirm that you want to change the master domain controller for the zone.
You should avoid changing from one master domain controller to another, if possible. Changing the master domain controller requires you to wait for replication to complete to see up-to-date zone information or modify information in the selected zone. In some cases, however, changing the master domain controller might be unavoidable. For example, if there are zones connecting to a master domain controller that has a hardware failure or must be taken offline for maintenance, you will need to configure a new master domain controller for the zones to use.
If you change the master domain controller, you should run the Analyze command afterwards to check the Active Directory forest and verify that no duplicate UIDs or GIDs have been introduced.