Microsoft KB Archive/174352

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XWEB: How to Improve Error Messages for T'shooting Web Access

Article ID: 174352

Article Last Modified on 10/28/2006


  • Microsoft Outlook Web Access 5.5
  • Microsoft Exchange Active Server Components 5.0

This article was previously published under Q174352

IMPORTANT: This article contains information about editing the registry. Before you edit the registry, make sure you understand how to restore it if a problem occurs. For information on how to do this, view the "Restoring the Registry" online Help topic in Regedit.exe or the "Restoring a Registry Key" online Help topic in Regedt32.exe.


When troubleshooting the Web Access components, it is sometimes helpful to receive a more detailed error message from the server. For example, the error message, "Failed to get Inbox," does not help you understand why you failed to get the Inbox.


Adding the following registry entry to the Exchange Server computer will return a more detailed error to the browser.

WARNING: Using Registry Editor incorrectly can cause serious problems that may require you to reinstall Windows. Microsoft cannot guarantee that problems resulting from the incorrect use of Registry Editor can be solved. Use Registry Editor at your own risk.

For information about how to edit the registry, view the "Changing Keys And Values" online Help topic in Registry Editor (Regedit.exe) or the "Add and Delete Information in the Registry" and "Edit Registry Data" online Help topics in Regedt32.exe. Note that you should back up the registry before you edit it.

  1. Start Registry Editor (Regedt32.exe).
  2. Find the following registry key


    NOTE: The above registry key is one path; it has been wrapped for readability.

  3. On the Edit menu, click Add Value. In the Value Name box, enter "Debug".
  4. Set the Data Type to DWORD and click OK.
  5. In the Data box, enter "1". Click the Hex radio button, and click OK.

This will enable the Exchange Server computer to return a more detailed error message to the browser such as:

Failed to get Inbox
The information store could not be opened. [MAPI 1.0 -

You can then research the MAPI error indicated by the error number returned in the error message, in this example, 80040111:

Description: This error code results when the EMS server refuses to
let a MAPI client log on.

For additional information, please see the following articles in the Microsoft Knowledge Base:

167003 XWEB: Troubleshooting Active Server Components

173470 XCLN: Troubleshooting "Failed to get Inbox" Error Message

Keywords: kbhowto KB174352