Microsoft KB Archive/926115

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Article ID: 926115

Article Last Modified on 10/30/2007


  • Microsoft Exchange Server 2003 Service Pack 1


Consider the following scenario. You use a third-party program to log on to Microsoft Office Outlook Web Access in Microsoft Exchange Server 2003 Service Pack 1 (SP1). When the session that is opened by the third-party program expires, you are prompted to reauthenticate in Outlook Web Access. In this scenario, the logon process stops responding when you try to reauthenticate.

After you experience several failures when you try to reauthenticate 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:


Because of file dependencies, Exchange 2003 SP1 must be installed before you apply this 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 this 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 a previously released hotfix.

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 item in Control Panel.

File name File version File size Date Time Platform
Owaauth.dll 6.5.7234.18 67,584 20-Nov-2006 23:45 x86


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


The third-party products that this article discusses are manufactured by companies that are independent of Microsoft. Microsoft makes no warranty, implied or otherwise, about the performance or reliability of these products.

Additional query words: XCCC OWA

Keywords: kbfix kbexchowa kbexpertiseinter kbhotfixserver kbqfe KB926115