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Error message when you try to open a mapped DFS folder after the computer comes out of standby in Windows XP: "<Drive Letter>:\ is not accessible"

Support for Windows XP has ended

Microsoft ended support for Windows XP on April 8, 2014. This change has affected your software updates and security options. Learn what this means for you and how to stay protected.

On a client computer that is running Windows XP Service Pack 2 (SP2) or Service Pack 3 (SP3), you may experience the following symptoms after the computer comes out of standby:
  • You try to open a mapped Distributed File System (DFS) folder. When you do this, you may receive the following error message:
    Drive Letter:\ is not accessible.
  • If you open the properties of the mapped DFS drive, you may see a status of Offline that is displayed in the General tab.When you click Check Status in the DFS tab, the active DFS target may show Unreachable in the Status column of the Referral list.
  • The Offline Files Status window may be displayed as as Offline in the Status column, and Unavailable for reconnect in the Information column.
  • At a command prompt, you run the following command:
    start \\\DFSroot
    Then, you may see an error window that contains the following error:
    The network path was not found.
  • At a command prompt, you run the following command:
    net view \\
    Then, you may receive the following error message:
    The server is not configured for transactions.
    More help is available by typing NET HELPMSG 2141.

Hotfix information

A supported hotfix is 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 software update that contains this hotfix.

If the hotfix is available for download, there is a "Hotfix download available" section at the top of this Knowledge Base article. If this section does not appear, contact Microsoft Customer Service and Support to obtain the hotfix.

Note If additional issues occur or if 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. For a complete list of Microsoft Customer Service and Support telephone numbers or to create a separate service request, visit the following Microsoft Web site: Note The "Hotfix download available" form displays the languages for which the hotfix is available. If you do not see your language, it is because a hotfix is not available for that language.


To apply this hotfix, you must have Windows XP Service Pack 2, or Windows XP Service Pack 3 installed on the computer.

Restart requirement

You have to restart the computer after you apply this hotfix.

Hotfix replacement information

This hotfix does not replace any other previously released hotfixes.

Registry information

Version 3 of the KB947460 hotfix introduces a new registry key to enable and disable the fix.

After you install this hotfix, the following registry item is added to the registry:


Name: CscDfsDriveCompat
Value: 1

If the value is 1 , the new behavior of this hotfix (Offline Files with Dfs Drive Mapping Compatibility) is enabled.If the value is 0, or if this item is deleted, the new behavior of this hotfix is disabled.

  • Only version 3 of KB947460 sets a value of 1 (enabled) when the hotfix is installed. Versions 1 and 2 do not use this key.
  • The default value for CscDfsDriveCompat is 1 (TRUE) after the hotfix is installed. If you set this value to 0 (FALSE), the changed behavior of this hotfix is disabled.
  • If you install any later QFE binary for Mrxsmb.sys (For example, KB978251, "MS10-006: Vulnerabilities in SMB client could allow remote code execution") without prior explicit installation of KB947460, the CscDfsDriveCompat registry key does not exist. This results in the same behavior as setting CscDfsDriveCompat to zero (0).
  • If you uninstall KB947460, CscDfsDriveCompat is deleted.

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.

Windows XP Service Pack 2

File nameFile versionFile sizeDateTimePlatformSP requirement

Windows XP Service Pack 3

File nameFile versionFile sizeDateTimePlatformSP requirement
Cscdll.dll5.1.2600.5731 102,40020-Dec-200821:39x86SP3
Mrxsmb.sys5.1.2600.5731 456,70419-Dec-200814:15x86SP3
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.
For more information, 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

Article ID: 947460 - Last Review: 10/08/2011 10:21:00 - Revision: 4.0

  • Microsoft Windows XP Service Pack 3
  • Microsoft Windows XP Service Pack 2
  • kbautohotfix kbqfe kbexpertiseinter kbtshoot KB947460
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