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Microsoft KB Archive/255820

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Knowledge Base

SMS: SMS_NT_Logon_Server_Manager Component Is Now Multithreaded

Article ID: 255820

Article Last Modified on 10/27/2006


  • Microsoft Systems Management Server 2.0 Standard Edition

This article was previously published under Q255820

IMPORTANT: This article contains information about modifying the registry. Before you modify the registry, make sure to back it up and make sure that you understand how to restore the registry if a problem occurs. For information about how to back up, restore, and edit the registry, click the following article number to view the article in the Microsoft Knowledge Base:

256986 Description of the Microsoft Windows Registry


In large Microsoft Windows NT and Microsoft Windows 2000 domains that contain many domain controllers and multiple sites with Windows NT Logon Discovery or Windows NT Logon Installation enabled, there may be competition for control of the domain during logon point updates. This can cause sites to be marked as inactive (dead), which results in the uninstallation of the logon point components for that site on all domain controllers. An indication of this condition is the absence of a folder corresponding with the site code for the site in the Smslogon\Sites folder on the domain controllers.

SMS_NT_Logon_Server_Manager (LSM) is a thread of SMS_Executive that handles the creation and management of logon points for the site. Before Service Pack 2, LSM was a single-threaded program so it could only update one domain controller at a time.

In Systems Management Server (SMS) 2.0 Service Pack 2 and later, LSM is a multithreaded program. Because of this change, the time it takes to complete a logon server management cycle is reduced significantly. There is also a change to the behavior of LSM as it relates to LSM marking the sites as inactive (dead).

For additional information about this change, click the article number below to view the article in the Microsoft Knowledge Base:

259816 SMS: Changes to the Way SMS Logon Server Manager Handles Inactive Sites

For additional information on how to obtain the latest Systems Management Server 2.0 service pack, click the article number below to view the article in the Microsoft Knowledge Base:

236325 How to Obtain the Latest Systems Management Server 2.0 Service Pack


WARNING: If you use Registry Editor incorrectly, you may cause serious problems that may require you to reinstall your operating system. Microsoft cannot guarantee that you can solve problems that result from using Registry Editor incorrectly. Use Registry Editor at your own risk.

To change the number of threads assigned to LSM, use the following steps:

  1. Start Registry Editor (Regedt32.exe).
  2. Locate the Max Concurrent Threads for Updating BDCs value in the following registry key:


  3. On the Edit menu, click DWORD.
  4. Type the appropriate number of threads, and then click OK.
  5. Quit Registry Editor.

Additional query words: prodsms multi-thread multi-threaded

Keywords: kbbug kbenv kbinfo kbsms200fix kbsms200sp2fix KB255820