Microsoft KB Archive/926114

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Article ID: 926114

Article Last Modified on 10/25/2007


  • Microsoft Exchange Server 2003 Enterprise Edition
  • Microsoft Exchange Server 2003 Standard Edition


Consider the following scenario. You use a third-party program to log on to Microsoft Outlook Web Access in Microsoft Exchange Server 2003. When the session that is opened by the third-party program expires, you are prompted to authenticate again in Outlook Web Access. In this scenario, the logon process stops responding when you try to authenticate again.

Additionally, after you experience several failures when you try to authenticate again in Outlook Web Access, you may experience the following symptoms:

  • Microsoft Internet Information Services (IIS) may automatically disable the Exchange application pool. When the Exchange application pool is disabled, the following event is logged in the Application log:

    Event ID: 1002
    Event Type: Error
    Event Source: W3SVC
    Event Category: None
    Date: Date
    Time: Time
    User: N/A
    Computer: Server_Name
    Description: Application pool 'ExchangeApplicationPool' is being automatically disabled due to a series of failures in the process(es) serving that application pool.

  • To make Outlook Web Access available again, you restart IIS. However, the symptoms occur again after some time.


This problem occurs if the pFilterContext pointer is set to NULL. The Outlook Web Access authentication process does not expect this pointer to be set to NULL.


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:

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:


You must install Microsoft Exchange Server 2003 Service Pack 2 (SP2) before you install the hotfix.

For more information, click the following article number to view the article in the Microsoft Knowledge Base:

836993 How to obtain the latest service packs for Exchange Server 2003

Restart requirement

You do not have to restart the computer after you apply the hotfix. However, the hotfix installer will restart the following services:

  • The HTTP SSL service
  • The IIS Admin service
  • The Microsoft Exchange Routing Engine service
  • The Simple Mail Transfer Protocol (SMTP) service
  • The World Wide Web Publishing service

Hotfix replacement information

This hotfix does not replace any other hotfixes.

File information

The global 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 item in Control Panel.

File name File version File size Date Time Platform
Owaauth.dll 6.5.7651.55 69,120 11-Oct-2006 23:12 x86


Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.


For more information about the terminology that Microsoft uses for software that is corrected after it is released, 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 software updates

For more information about the naming schema for Exchange software updates, click the following article number to view the article in the Microsoft Knowledge Base:

817903 New naming schema for Exchange Server software update packages

Additional query words: XCCC OWA

Keywords: kbexchangeowa kbhotfixserver kbqfe kbfix kbbug kbpubtypekc KB926114