Knowledge Base

Performance decreases, response times for SPN queries are longer than expected, and Lsass.exe CPU use peaks at 100 percent on a domain controller that is running Windows 2000

Article ID: 822554

Article Last Modified on 10/26/2006

APPLIES TO

Microsoft Windows 2000 Server
Microsoft Windows 2000 Advanced Server

SYMPTOMS

The performance of a Microsoft Windows 2000-based domain controller may decrease significantly, response times to service principal name (SPN) queries may become longer that expected, and Lsass.exe may peak at 100-percent CPU use.

CAUSE

This behavior occurs when the domain controller receives many Kerberos ticket-granting service (TGS) requests for an SPN that is a subset of a common value. A typical example is the case of the names of all client computers in a domain having the same prefix as the name of the domain where they are members. They register an SPN of the following:

HOST/DomainName Suffix

If a Kerberos TGS request for HOST/DomainName is issued against a domain controller, a query that uses "HOST/DomainName*" is performed instead of a query that uses the exact match of "HOST/DomainName". This problem may occur in environments with many workstations, where this naming convention is in use.

RESOLUTION

Hotfix information

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:

http://support.microsoft.com/contactus/?ws=support

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.

Prerequisites

No prerequisites are required.

Restart requirement

You must restart your computer after you apply this hotfix.

Hotfix replacement information

This hotfix does not replace any other hotfixes.

File information

The English version of this hotfix has the file attributes (or later) 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.

   Date         Time   Version          Size     File name
   -----------------------------------------------------------
   11-Aug-2003  09:04  5.0.2195.6748    124,688  Adsldp.dll       
   11-Aug-2003  09:04  5.0.2195.6748    132,368  Adsldpc.dll      
   11-Aug-2003  09:04  5.0.2195.6748     63,760  Adsmsext.dll     
   11-Aug-2003  09:04  5.0.2195.6800    381,712  Advapi32.dll     
   11-Aug-2003  09:04  5.0.2195.6753     69,392  Browser.dll      
   11-Aug-2003  09:04  5.0.2195.6680    134,928  Dnsapi.dll       
   11-Aug-2003  09:04  5.0.2195.6780     96,528  Dnsrslvr.dll     
   11-Aug-2003  09:04  5.0.2195.6753     47,376  Eventlog.dll     
   11-Aug-2003  09:04  5.0.2195.6759    148,240  Kdcsvc.dll       
   18-Jun-2003  09:43  5.0.2195.6758    205,072  Kerberos.dll     
   26-Mar-2003  13:37  5.0.2195.6695     71,888  Ksecdd.sys
   01-Aug-2003  09:40  5.0.2195.6797    509,712  Lsasrv.dll       
   01-Aug-2003  09:40  5.0.2195.6797     33,552  Lsass.exe        
   17-Jul-2003  15:13  5.0.2195.6786    109,840  Msv1_0.dll       
   11-Aug-2003  09:04  5.0.2195.6601    311,568  Netapi32.dll     
   11-Aug-2003  09:04  5.0.2195.6791    361,232  Netlogon.dll     
   11-Aug-2003  09:04  5.0.2195.6801    931,600  Ntdsa.dll        
   11-Aug-2003  09:04  5.0.2195.6742    392,464  Samsrv.dll       
   11-Aug-2003  09:04  5.0.2195.6737    131,344  Scecli.dll       
   11-Aug-2003  09:04  5.0.2195.6737    306,448  Scesrv.dll       
   15-Jul-2003  14:08  5.0.2195.6776  4,858,368  Sp3res.dll       
   11-Aug-2003  09:04  5.0.2195.6601     51,472  W32time.dll      
   16-Aug-2002  05:32  5.0.2195.6601     57,104  W32tm.exe        
   11-Aug-2003  09:04  5.0.2195.6741    126,224  Wldap32.dll

WORKAROUND

To work around this problem, add the SPN that is being requested to an arbitrary computer account. For additional information, click the following article number to view the article in the Microsoft Knowledge Base:

157234 HOWTO: Deal with localized and renamed user and group names

STATUS

Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section of this article.

MORE INFORMATION

For additional information about how hotfix packages are named, click the following article number to view the article in the Microsoft Knowledge Base:

816915 New naming schema for Microsoft Windows hotfix packages

Additional query words: ServicePrincipalName

Keywords: kbhotfixserver kbqfe kbwin2000presp5fix kbqfe kbfix kbbug KB822554

Microsoft KB Archive/822554

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