Topic Last Modified: 2005-11-18

The Microsoft® Exchange Server Analyzer Tool reads the following registry entry to determine whether the default administrative shares have been disabled:


If the Exchange Server Analyzer finds that the value for AutoShareServer is set to 0, an error is displayed.

This error indicates that the default server-created administrative shares have been disabled on this server. An online backup or restoration of Exchange Server may not work when the default administrative shares have been disabled. Depending on the backup program, you may receive the error messages when trying to restore data. You may also see error messages in the tape backup log.

Additionally, when the administrative shares have been removed, you may receive the following message during an online backup of Exchange Server: Unexpected error 0xc0040000 the Microsoft Exchange Server computer is not available. To resolve this problem, it is recommended that the default administrative shares be re-enabled by editing the registry and restarting the Server service.

This article contains information about editing the registry. Before you edit the registry, make sure you understand how to restore the registry if a problem occurs. For information about how to restore the registry, view the "Restore the Registry" Help topic in Regedit.exe or Regedt32.exe.
To correct this error
  1. Open a registry editor, such as Regedit.exe or Regedt32.exe.

  2. Navigate to: HKLM\System\CurrentControlSet\Services\LanmanServer\Parameters

  3. In the right pane, locate and double-click AutoShareServer.

  4. Change the value from 0 to 1.

  5. Close the registry editor, and restart the Server service for the change to take effect.

Before you edit the registry, and for information about how to edit the registry, see the Microsoft Knowledge Base article 256986, "Description of the Microsoft Windows registry" (

For more information about restoring the default administrative shares in Microsoft Windows Server™ 2003, see the Knowledge Base article 816113, "HOW TO: Use Registry Editor to Restore Administrative Shares in Windows Server 2003" (