After you install Microsoft Windows XP Service Pack 2 (SP2) on a computer that is running Windows XP, you cannot connect to a remote computer by using the remote desktop connection tool. Additionally, you receive the following error message:

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This problem occurs when Distributed File Systems (DFS) Client functionality is disabled in the following registry subkey on a Windows XP SP2-based computer: When DFS is disabled on a Windows XP SP2-based computer, the Remote Desktop Protocol (RDP) causes the connection to fail.

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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.

Prerequisites

Because of file dependencies, you must have Windows XP SP2 installed to install this hotfix requires.

Restart requirement

You do not have to restart the computer after you apply this software update.

Hotfix replacement information

This hotfix does not replace any other hotfixes.

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.

File name	File version	File size	Date	Time	Platform
Rdpdr.sys	5.1.2600.2689	195,200	02-Jun-2005	01:42	x86

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Important This section, method, or task contains steps that tell you how to modify the registry. However, serious problems might occur if you modify the registry incorrectly. Therefore, make sure that you follow these steps carefully. For added protection, back up the registry before you modify it. Then, you can restore the registry if a problem occurs. For more information about how to back up and restore the registry, click the following article number to view the article in the Microsoft Knowledge Base: To work around this problem, re-enable the DFS client in the registry. To do this, follow these steps.

1.	Click Start, click Run, type regedt32 in the Open box, and then click OK.
2.	In Registry Editor, locate and then click the following registry subkey: HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Mup
3.	In the details pane on the right, double-click DisableDFS. If the value in the Value data box is 1, the DFS client is disabled. If the value in the Value data box is 0, the DFS client is enabled.
4.	In the Edit DWORD Value dialog box, type 0 in the Value data box, and then click OK.
5.	On the File menu, click Exit to quit Registry Editor.

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

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