Microsoft KB Archive/892988

= An access violation may occur when you use an ISAPI filter in IIS 6.0 =

Article ID: 892988

Article Last Modified on 12/3/2007

-

APPLIES TO


 * Microsoft Internet Information Services 6.0

-





SYMPTOMS
When you use an Internet Server API (ISAPI) filter that calls the GetServerVariable function to retrieve the AUTH_TYPE server variable before the user is authenticated, an access violation may occur.

Also, error messages that are similar to the following may be logged in the system event log:

Event Type: Warning

Event Source: W3SVC

Event Category: None

Event ID: 1009

Description: A process serving application pool 'DefaultAppPool' terminated unexpectedly. The process ID was '2928'. The process exit code was '0xc0000005'.



CAUSE
The AUTH_TYPE server variable is populated from data that is contained in an internal object. The object stores information about the user and about how the user was authenticated. If the AUTH_TYPE server variable is requested in a filter before the user is authenticated in Microsoft Internet Information Services (IIS), the pointer to that internal object is NULL, and an access violation occurs.



Hotfix information
A supported hotfix is now 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. This hotfix might receive additional testing. Therefore, if you are not severely affected by this problem, we recommend that you wait for the next service pack that contains this hotfix.

To resolve this problem, submit a request to Microsoft Online Customer Services to obtain the hotfix. To submit an online request to obtain the hotfix, visit the following Microsoft Web site:

http://go.microsoft.com/?linkid=6294451

Note If additional issues occur or 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. To create a separate service request, visit the following Microsoft Web site:

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

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 file attributes) 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 -- 25-Jan-2005 08:31  6.0.3790.256        9,728  W3comlog.dll 25-Jan-2005 08:31  6.0.3790.256      342,528  W3core.dll



STATUS
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the &quot;Applies to&quot; section.

Keywords: kbbug kbfix kbqfe kbauthentication kbwinserv2003presp1fix kbhotfixserver KB892988

-

[mailto:TECHNET@MICROSOFT.COM Send feedback to Microsoft]

© Microsoft Corporation. All rights reserved.