You Receive an "Account Unknown" Message When You Assign a Permission to a File or You Add a Member to a Group


When you try to assign a permission to a file or to add a member to a group, an Object Picker dialog box may display the message "Account unknown." You may also receive the following error message:
sid2name S-1-5-21-1482476501-688789844-725345543-512
LookupAccountSid failed, LastError = 1789


This problem occurs because Windows cannot resolve security identifiers (SIDs) to names. An SID is a numeric value that identifies a user or group. For each access control entry (ACE), an SID identifies the user or the group for whom access is permitted, denied, or audited.


Hotfix Information

A supported hotfix is available from Microsoft. However, this hotfix is intended to correct only the problem that is described in this article. Apply this hotfix only to systems that are experiencing this specific problem.

If the hotfix is available for download, there is a "Hotfix download available" section at the top of this Knowledge Base article. If this section does not appear, submit a request to Microsoft Customer Service and Support to obtain the hotfix.

Note If additional issues occur or if any troubleshooting is required, you might have to create a separate service request. The usual support costs will apply to additional support questions and issues that do not qualify for this specific hotfix. For a complete list of Microsoft Customer Service and Support telephone numbers or to create a separate service request, visit the following Microsoft Web site: Note The "Hotfix download available" form displays the languages for which the hotfix is available. If you do not see your language, it is because a hotfix is not available for that language.


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
06-Aug-2003 22:42 5.0.2195.6748 124,688 Adsldp.dll
06-Aug-2003 22:42 5.0.2195.6748 132,368 Adsldpc.dll
06-Aug-2003 22:42 5.0.2195.6748 63,760 Adsmsext.dll
06-Aug-2003 22:42 5.0.2195.6800 381,712 Advapi32.dll
06-Aug-2003 22:42 5.0.2195.6753 69,392 Browser.dll
06-Aug-2003 22:42 5.0.2195.6680 134,928 Dnsapi.dll
06-Aug-2003 22:42 5.0.2195.6780 96,528 Dnsrslvr.dll
06-Aug-2003 22:42 5.0.2195.6753 47,376 Eventlog.dll
06-Aug-2003 22:42 5.0.2195.6759 148,240 Kdcsvc.dll
18-Jun-2003 17:43 5.0.2195.6758 205,072 Kerberos.dll
26-Mar-2003 21:37 5.0.2195.6695 71,888 Ksecdd.sys
01-Aug-2003 17:40 5.0.2195.6797 509,712 Lsasrv.dll
01-Aug-2003 17:40 5.0.2195.6797 33,552 Lsass.exe
17-Jul-2003 23:13 5.0.2195.6786 109,840 Msv1_0.dll
06-Aug-2003 22:42 5.0.2195.6601 311,568 Netapi32.dll
06-Aug-2003 22:42 5.0.2195.6791 361,232 Netlogon.dll
06-Aug-2003 22:42 5.0.2195.6800 931,600 Ntdsa.dll
06-Aug-2003 22:42 5.0.2195.6800 51,472 Samlib.dll
06-Aug-2003 22:42 5.0.2195.6742 392,464 Samsrv.dll
06-Aug-2003 22:42 5.0.2195.6737 131,344 Scecli.dll
06-Aug-2003 22:42 5.0.2195.6737 306,448 Scesrv.dll
15-Jul-2003 22:08 5.0.2195.6776 4,858,368 Sp3res.dll
06-Aug-2003 22:42 5.0.2195.6601 51,472 W32time.dll
16-Aug-2002 13:32 5.0.2195.6601 57,104 W32tm.exe
06-Aug-2003 22:42 5.0.2195.6741 126,224 Wldap32.dll


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
For additional information about the terminology that is used in this article, click the following article number to view the article in the Microsoft Knowledge Base:

824684 Description of the Standard Terminology That Is Used to Describe Microsoft Product Updates, Tools, and Add-ons


ID d'article : 826452 - Dernière mise à jour : 13 juin 2008 - Révision : 1