If a domain's Distributed File System (DFS) root server is unavailable, a client computer that is running Windows Vista cannot connect to another DFS server that is listed in the referral when the client computer tries to connect to the DFS root server. DFS failover does not occur. When the client computer tries to connect to the offline DFS server, you receive an error message that resembles the following:

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This problem occurs because the NetBIOS over TCP/IP (NetBT) layer returns an incorrect code. This code does not trigger a DFS failover in the DFS client engine.

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Update information

Windows Vista

http://www.microsoft.com/downloads/details.aspx?FamilyId=B729A48F-19F3-4394-A788-E60F837FF3F4 (http://www.microsoft.com/downloads/details.aspx?FamilyId=B729A48F-19F3-4394-A788-E60F837FF3F4)

Windows Vista x64-based System

http://www.microsoft.com/downloads/details.aspx?FamilyId=C2C9623A-23B9-47DB-ADE3-26B78BF1E1FB (http://www.microsoft.com/downloads/details.aspx?FamilyId=C2C9623A-23B9-47DB-ADE3-26B78BF1E1FB)

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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: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:

Prerequisites

No prerequisites are required.

Restart requirement

You must restart the computer after you apply this hotfix.

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 item in Control Panel.

Windows Vista, 32-bit versions

File name	File version	File size	Date	Time	Platform
Update.mum	Not Applicable	1,992	07-Mar-2007	21:11	Not Applicable
X86_1967f1bfadcbeeb5ccf5bfe314b007b6_31bf3856ad364e35_6.0.6000.20551_none_d5aa314e4128c82e.manifest	Not Applicable	693	07-Mar-2007	21:11	Not Applicable
X86_microsoft-windows-netbt_31bf3856ad364e35_6.0.6000.20551_none_5ed313691362e0fc.manifest	Not Applicable	20,518	07-Mar-2007	21:12	Not Applicable
Netbt.sys	6.0.6000.20551	184,320	07-Mar-2007	02:08	x86
Netbtugc.exe	6.0.6000.20551	21,504	07-Mar-2007	02:08	x86

Windows Vista, 64-bit versions

File name	File version	File size	Date	Time	Platform
Amd64_ae63d3e85671297b72d5db2eef1c20ee_31bf3856ad364e35_6.0.6000.20551_none_5004e53026ecd7c8.manifest	Not Applicable	697	07-Mar-2007	21:11	Not Applicable
Amd64_microsoft-windows-netbt_31bf3856ad364e35_6.0.6000.20551_none_baf1aeeccbc05232.manifest	Not Applicable	20,544	07-Mar-2007	21:16	Not Applicable
Update.mum	Not Applicable	2,004	07-Mar-2007	21:11	Not Applicable
Netbt.sys	6.0.6000.20551	233,472	07-Mar-2007	02:35	x64
Netbtugc.exe	6.0.6000.20551	24,064	07-Mar-2007	02:35	x64

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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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A similar problem may occur when you use offline file synchronization in Windows Vista. When you access offline files on a client computer that is not connected to the DFS root server, you receive an error message that resembles the following:For more information about the terms that are used to describe software updates, click the following article number to view the article in the Microsoft Knowledge Base:

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