HKLM\SYSTEM\CurrentControlSet\Services\Tcpip\Parameters

Description

Determines whether the DNS client performs name devolution.

By default, when a query fails for a name to which a primary DNS suffix has been attached, the DNS client drops the left-most label of the primary DNS suffix on each successive attempt, making the query more general. This is known as name devolution. For example, if the primary DNS suffix ooo.aaa.reskit.com is attached to the name reskituser and if the query for reskituser.ooo.aaa.reskit.com fails, the DNS client devolves (drops the left-most label) the primary DNS suffix and submits a query for reskituser.aaa.reskit.com. The DNS client devolves the primary DNS suffix on each attempt until the name is successfully resolved or the name to be submitted has fewer than two labels.

You can add this entry to the registry with a value of 0 to disable name devolution.

Change method

To disable name devolution, use Network and Dial-up Connections. Right-click the name of a connection, select Internet Protocol (TCP/IP), click Properties, click Advanced, click the DNS tab, and clear the Append parent suffixes of the primary DNS suffix check box.