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JSI Tip 2167. Windows NT 4.0 generates Event ID 1540 when I attempt to add a Reverse Lookup Zone?

When you try to add any of the following Reverse Loopup Zones in DNS manager:

You receive:

The new zone couldn't be created because there is already a zone by this name. Verify that the zone name was entered correctly or choose a new zone name.

and the System Event log contains:

Event ID: 1540
Source: DNS
Type: Error
Description: DNS Server unable to create domain node.

To resolve the problem, use Regedt32 to navigate to:


Set the REG_DWORD value name ShowAutoCreatedZones to 1.

Navigate to:


Set the REG_DWORD value name DisableAutoReverseZones to 0.

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