Microsoft KB Archive/822554

= 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

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APPLIES TO


 * Microsoft Windows 2000 Server
 * Microsoft Windows 2000 Advanced Server

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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/

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



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 &quot;Applies to&quot; 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

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