Microsoft KB Archive/326849

= A logon attempt succeeds even though the user part of the user principal name (UPN) is different from the SAM account user name or is longer than 20 characters =

Article ID: 326849

Article Last Modified on 2/28/2007

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APPLIES TO


 * Microsoft Windows 2000 Advanced Server
 * Microsoft Windows 2000 Server
 * Microsoft Windows 2000 Professional Edition

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This article was previously published under Q326849





SYMPTOMS
When you log on by using the Security Accounts Manager (SAM) name, the logon attempt succeeds. The logon attempt does not succeed when the user part of the user principal name (UPN) is longer than 20 characters or is different from the SAM account user name.

The SAM account uses the following format:

\

The UPN uses the following format:

@

Note  is the fully qualified domain name.

In Microsoft Windows 2000, any UPN that is explicitly used and that has the following characteristics does not typically pass authentication:
 * The UPN is different from the SAM account user name.
 * The UPN contains a user part that is longer than 20 characters.



Service pack information
To resolve this problem, obtain the latest service pack for Microsoft Windows 2000. For additional information, click the following article number to view the article in the Microsoft Knowledge Base:

260910 How to obtain the latest Windows 2000 service pack

Hotfix information
A supported hotfix is now available from Microsoft, but it is only intended to correct the problem that is described in this article. Only apply it to systems that are experiencing this specific problem. This hotfix may receive additional testing. Therefore, if you are not severely affected by this problem, we recommend that you wait for the next Windows 2000 service pack that contains this hotfix.

To resolve this problem immediately, 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.

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 --  27-Sep-2002  23:29  5.0.2195.6069     124,176  Adsldp.dll 27-Sep-2002 23:29  5.0.2195.5781     131,344  Adsldpc.dll 27-Sep-2002 23:29  5.0.2195.5781      62,736  Adsmsext.dll 27-Sep-2002 23:29  5.0.2195.6052     358,160  Advapi32.dll 27-Sep-2002 23:29  5.0.2195.6058      49,424  Browser.dll 27-Sep-2002 23:29  5.0.2195.6012     135,952  Dnsapi.dll 27-Sep-2002 23:29  5.0.2195.6012      96,016  Dnsrslvr.dll 27-Sep-2002 23:29  5.0.2195.5722      45,328  Eventlog.dll 27-Sep-2002 23:29  5.0.2195.6059     146,704  Kdcsvc.dll 06-Sep-2002 01:18  5.0.2195.6048     200,976  Kerberos.dll 21-Aug-2002 16:27  5.0.2195.6023      71,248  Ksecdd.sys 26-Sep-2002 02:01  5.0.2195.6072     507,664  Lsasrv.dll 26-Sep-2002 02:01  5.0.2195.6072      33,552  Lsass.exe 27-Aug-2002 22:53  5.0.2195.6034     108,816  Msv1_0.dll 27-Sep-2002 23:29  5.0.2195.5979     307,472  Netapi32.dll 27-Sep-2002 23:29  5.0.2195.5966     360,720  Netlogon.dll 27-Sep-2002 23:29  5.0.2195.6048     918,800  Ntdsa.dll 27-Sep-2002 23:29  5.0.2195.6025     389,392  Samsrv.dll 27-Sep-2002 23:29  5.0.2195.5951     129,296  Scecli.dll 27-Sep-2002 23:29  5.0.2195.5951     302,864  Scesrv.dll 10-Sep-2002 15:50  5.0.2195.6053     123,392  Sp3res.dll 13-Jun-2001 05:05  5.0.2195.3727       3,856  Svcpack1.dll 27-Sep-2002 23:29  5.0.2195.5859      48,912  W32time.dll 04-Jun-2002 21:32  5.0.2195.5859      57,104  W32tm.exe 27-Sep-2002 23:29  5.0.2195.6052     126,224  Wldap32.dll 26-Sep-2002 02:01  5.0.2195.6072     507,664  Lsasrv.dll



STATUS
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the &quot;Applies to&quot; section. This problem was first corrected in Windows 2000 Service Pack 4.



MORE INFORMATION
For additional information about how to obtain a hotfix for Windows 2000 Datacenter Server, click the following article number to view the article in the Microsoft Knowledge Base:

265173 The Datacenter Program and Windows 2000 Datacenter Server product

For additional information about how to install multiple hotfixes while restarting only one time, click the following article number to view the article in the Microsoft Knowledge Base:

296861 How to install multiple Windows updates or hotfixes with only one reboot

Keywords: kbhotfixserver kbqfe kbbug kbfix KB326849

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