Article ID: 873401
This article has been archived. It is offered "as is" and will no longer be updated.
When you install the MS04-021
(http://www.microsoft.com/technet/security/Bulletin/MS04-021.mspx)security update on a Microsoft Windows NT 4.0 server that is running Microsoft Internet Information Server (IIS) 4.0, and certain Internet Server API (ISAPI) filters are installed, the Inetinfo.exe process may not respond, and an access violation exception may occur.
On servers that are experiencing this problem, the Drwtsn32.log file contains a fault at the following line:
This problem occurs when an ISAPI filter registers for the SF_NOTIFY_PREPROC_HEADERS notification and handles the request from this notification. In this case, IIS tries to access a non-existent metadata object, and an access violation occurs.
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:
PrerequisitesThis hotfix requires Microsoft Windows NT 4.0 Service Pack 6a.
Note We recommend that you install MS04-021 on all Windows NT 4.0 servers before you install this hotfix.
Restart requirementYou must restart your computer after you apply this hotfix.
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.
Note Because of file dependencies, this hotfix requires Microsoft Windows NT 4.0 Service Pack 6a.
Date Time Version Size File name -------------------------------------------------------------- 16-Jul-2004 13:39 4.2.789.1 515,072 Adsiis.dll 16-Jul-2004 13:40 4.2.789.1 851,456 Asp.dll 16-Jul-2004 13:39 4.2.789.1 140,288 Httpodbc.dll 16-Jul-2004 13:38 4.2.789.1 172,544 Iislog.dll 16-Jul-2004 13:38 4.2.789.1 490,496 Infocomm.dll 16-Jul-2004 13:38 4.2.789.1 67,584 Iscomlog.dll 16-Jul-2004 13:39 4.2.789.1 95,232 Ssinc.dll 16-Jul-2004 13:39 4.2.789.1 61,440 Sspifilt.dll 16-Jul-2004 13:39 4.2.789.1 538,112 W3svc.dll 16-Jul-2004 13:39 4.2.789.1 219,136 Wam.dll
The following filters have been found to cause this problem:
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