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When a Microsoft Windows NT 4.0 domain controller or a Microsoft Windows NT 4.0 workstation sends a "Query for Primary DC" mailslot message in a Microsoft Windows 2000-based domain, the Microsoft Windows 2000 Server primary domain controller may not respond, and the Windows NT-based server and Windows NT workstation may lose the security channel to the Windows 2000 primary domain controller.
This problem may occur if you make a major change in the Active Directory directory service site configuration. For example, this problem occurs if you change the subnet mask in the Active Directory site. The problem occurs because the Net Logon service is busy processing all the notifications that are generated from the subnet and the site change, and the Net Logon service cannot handle the "Query for Primary DC" mailslot message. The duration of the problem depends on how many changes have been made to the Active Directory site configuration, and the problem is corrected when the mailslot message can be processed.
This problem does not occur if the primary domain controller is Microsoft Windows Server 2003.
A supported hotfix is now available from Microsoft, but it is only intended to correct the problem that this article describes. Apply it only to systems that are experiencing this specific problem.
To resolve this problem, contact Microsoft Product Support Services to obtain the hotfix. For a complete list of Microsoft Product Support Services telephone numbers and information about support costs, visit the following Microsoft Web site:
Note In special cases, charges that are ordinarily incurred for support calls may be canceled if a Microsoft Support Professional determines that a specific update will resolve your problem. The usual support costs will apply to additional support questions and issues that do not qualify for the specific update in question.
No prerequisites are required.
You must restart your computer after you apply this hotfix.
Hotfix replacement information
This hotfix does not replace any other hotfixes.
The English version of this hotfix has the file attributes (or later file attributes) that are listed in the following table. The dates and times for these files are listed in coordinated universal time (UTC). When you view the file information, it is converted to local time. To find the difference between UTC and local time, use the Time Zone tab in the Date and Time tool in Control Panel.