Microsoft KB Archive/899902

= Users receive a 401 error message when they try to access a mailbox that is in an Exchange Server 2003 front-end server by using Outlook Web Access =

Article ID: 899902

Article Last Modified on 10/25/2007

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APPLIES TO


 * Microsoft Exchange Server 2003 Standard Edition
 * Microsoft Exchange Server 2003 Enterprise Edition

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SYMPTOMS
If a user tries to access a mailbox that is in a Microsoft Exchange Server 2003 front-end server by using Microsoft Outlook Web Access, the user receives a 401 error message.



CAUSE
By default, the Exprox.dll file builds the cache for the Exchange Server 2003 back-end server on the Exchange Server 2003 front-end server. The Exprox.dll file builds the cache by using the Dsaccess.dll file to provide a list of objects that has the msExchPrivateMDB attribute or the msExchPublicMDB attribute.

In a customer environment, if the values of the msExchPrivateMDB attribute are more than one thousand, the cache is incomplete. When a user tries to log on to the Exchange Server 2003 front-end server by using Outlook Web Access, the user receives a 401 error message. Additionally, the user cannot log on to the Exchange Server 2003 front-end server.



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
Because of file dependencies, this hotfix requires that Microsoft Exchange Server 2003 Service Pack 1 (SP1) be installed.

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 your computer after you apply this hotfix.

Hotfix replacement information
This hotfix does not replace any other 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 tool in Control Panel.   Date         Time   Version            Size    File name --  17-Sep-2005  02:43  6.5.7233.49       412,672  Exprox.dll



WORKAROUND
To work around this problem, you can perform one of the following methods:  Change the authentication method between the Exchange Server 2003 front-end server and the Exchange Server 2003 back-end server to basic authentication.

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

899384 You receive an &quot;HTTP Error 403&quot; error message when you try to log on to your mailbox in Outlook Web Access

 Add a public folder store to the Exchange Server 2003 front-end server. Increase the Lightweight Directory Access Protocol (LDAP) query page size.



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



MORE INFORMATION
For more information about the Microsoft Exchange Server 2003 Service Pack 2 version of this hotfix, click the following article number to view the article in the Microsoft Knowledge Base:

909989 Error message when you log on to Outlook Web Access on an Exchange Server 2003 front-end server: &quot;401&quot;

Additional query words: XCCC

Keywords: kbexchowa kbqfe kbfix kbbug kbpubtypekc KB899902

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