Friday, January 30, 2009

ForwardingTimeout Registry key

ForwardingTimeout reg key determines time to wait before the forwarding server responds to given dns query. The registry is located at "HKLM\SYSTEM\CurrentControlSet\Services \DNS\parameters". Following is the description of the reg key .

Key Name: ForwardingTimeout
Type: DWORD
Default: NoKey (No Timeout)
Value : value in seconds.
Location: "HKLM\SYSTEM\CurrentControlSet\Services \DNS\parameters"

This registry key is useful when multiple forwarders exists. Forexample, A dns server forwards a query to a forwarder by looking into its forwarding list. if the first forwarder fails to respond with in the timeout period, then the query will be sent to next forwarder in the list.


Note:
1. The ForwardingTimeout key is read onlywhen forwarders are configured.
2 This registry key is supported in windows 2000, windows 2003 and
windows 2008.
3. The ForwardingTimeout key needed only when forwarding is enabled.

Warning: 1. Do not directly modify the key in registry instead use the Forwarders tab in dns server properties dialog to set the forwarding timeout. In the forwarders tab dialog, Zero is not a valid value . If you enter Zero (0), In windows 2000, DNS uses the default value 0x5 but in windows 2003 and windows 2008 it used the value one (1).
2. If this key doesn't exists or contains invalid (-ve) value when forwarders are
configured, the server may fail to start or fail to resolve remote names properly.

Relevant Post:

set forwardingtimeout using dnscmd

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