Article ID: 291377 - View products that this article applies to.
This article was previously published under Q291377
Every 15 minutes, Microsoft Windows 2000 and Microsoft Windows XP domain member Distributed File System (DFS) clients query their domain controllers. This article discusses the registry and Group Policy Object (GPO) settings for the configuration of DFS name discovery on Windows XP domain members.
Windows client computers perform periodic discovery of domains and trusted domains in the forest. This discovery process runs against a domain controller from the domain that is hosting the client's computer account. This discovery process allows the Windows shell to more quickly distinguish queries for fully qualified domain names from fully qualified computer names.
Click Start click Run, type \\fully qualified domain name, and then click OK.The results of the discovery process are cached in a special table to avoid real time queries to domain controllers in the domain. You may need to modify this discovery process in the following types of environments:
Controlling Client DFS DiscoveryThere are two methods for controlling the client DFS discovery behavior, the "legacy" method and the new method.
Legacy MethodThe legacy method is a registry setting:
HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\LanmanWorkstation\DfsDcNameDelayNote The value is specified in minutes and cannot be less than 15 minutes.
New MethodFor the new method, use a GPO or a registry value. This sets how often a DFS Client discovers domain controllers.
Computer Configuration\Administrative Templates\Network\Registry
HKEY_LOCAL_MACHINE\Software\Policies\Microsoft\System\DFSClient\DfsDcNameDelayIn the new method, you can enable the DFS discovery interval in the GPO; thus, you can apply the discovery interval to specific Organizational Units (OU) that are hosting the computer accounts of interest, or on the root of the domain to affect all domain members.
Windows XP clients dynamically check for updates to the DFS discovery interval. The valid range for DfsDcNameDelay is 15 to 360 minutes. No reboot is required for new settings to take affect.
Windows XP Client DfsDcNameDelay Value Processing
(http://support.microsoft.com/kb/271374/ )Windows NT 4.0 SP6 clients contact the PDC every 21 minutes
(http://support.microsoft.com/kb/265395/ )Windows 2000 member runs discovery every 15 minutes
Article ID: 291377 - Last Review: December 3, 2007 - Revision: 5.6
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