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Network drives aren't mapped correctly from DFS namespace in Windows Server 2012 R2-based RDS server

This article describes an issue that occurs on a Windows Server 2012 R2-based computer that has the Remote Desktop Services (RDS) role installed. You can fix this issue by using the update in this article. Before you install this update, see the Prerequisites section.
Symptoms
Mapped network drives to a DFS share don't work for subsequent users. This issue occurs when the following conditions are true:
  • User Account Control (UAC) is enabled. 
  • The EnableLinkedConnections registry value is set to 1.

For example, user A connects to the RDS server and starts his RD session. At logon, all drives are mapped successfully and user A can see the network drives in Windows Explorer are connected. When user B connects to the RDS Server and logs on, the drives that were already mapped by user A are shown as disconnected in Windows Explorer. The disconnected network drives, which were connected by user A, are also shown as disconnected to all the subsequent users that log on after user A. 
How to get this update
You can get this update by using one of the following methods. We have released an update through Windows Update and Microsoft Update Catalog. Even though this issue is observed only in Windows Server 2012 R2, the update also applies to Windows 8.1 and Windows RT 8.1. 

Important If you install a language pack after you install this update, you must reinstall this update. Therefore, we recommend that you install any language packs that you need before you install this update. For more information, see Add language packs to Windows.

Method 1: Windows Update

This update is provided as an Optional update on Windows Update. For more information on how to run Windows Update, see How to get an update through Windows Update.

Method 2: Microsoft Update Catalog

To get the stand-alone package for this update, go to the Microsoft Update Catalog website.

Update detail information

Prerequisites

To apply this update, you must have April 2014 update rollup for Windows RT 8.1, Windows 8.1, and Windows Server 2012 R2 (2919355) installed in Windows 8.1 or Windows Server 2012 R2.

Registry information

To apply this update, you don't have to make any changes to the registry.

Restart requirement

You may have to restart the computer after you apply this update.

Update replacement information

This update doesn't replace a previously released update.
Status
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.
References
Learn about the terminology that Microsoft uses to describe software updates.
File Information
The English (United States) version of this software update installs files that have the attributes that are listed in the following tables.

Windows 8.1, Windows RT 8.1 and Windows Server 2012 R2

Notes
  • The files that apply to a specific product, milestone (RTM, SPn), and service branch (LDR, GDR) can be identified by examining the file version numbers as shown in the following table:
    VersionProductMilestoneService branch
    6.3.960 0.18 xxxWindows RT 8.1, Windows 8.1, and Windows Server 2012 R2RTMGDR
  • GDR service branches contain only those fixes that are widely released to address widespread, critical issues. LDR service branches contain hotfixes in addition to widely released fixes.
  • The MANIFEST files (.manifest) and the MUM files (.mum) that are installed for each environment are listed in the "Additional file information" section. MUM, MANIFEST, and the associated security catalog (.cat) files, are very important to maintain the state of the updated components. The security catalog files, for which the attributes are not listed, are signed with a Microsoft digital signature.
x86 Windows 8.1
File nameFile versionFile sizeDateTimePlatform
Dfsc.sys6.3.9600.18262103,93608-Mar-201614:45x86
x64 Windows 8.1 and Windows Server 2012 R2
File nameFile versionFile sizeDateTimePlatform
Dfsc.sys6.3.9600.18262138,24008-Mar-201614:44x64
Windows RT 8.1
File nameFile versionFile sizeDateTimePlatform
Dfsc.sys6.3.9600.1826299,32808-Mar-201614:47Not applicable

Additional file information

x86 Windows 8.1
File propertyValue
File nameUpdate.mum
File versionNot applicable
File size1,585
Date (UTC)08-Mar-2016
Time (UTC)20:59
PlatformNot applicable
File nameX86_59a481053ca97257b22bb96db03a27b6_31bf3856ad364e35_6.3.9600.18262_none_dc697897784a79fa.manifest
File versionNot applicable
File size697
Date (UTC)08-Mar-2016
Time (UTC)20:59
PlatformNot applicable
File nameX86_microsoft-windows-dfsclient_31bf3856ad364e35_6.3.9600.18262_none_1c4d623301a745a7.manifest
File versionNot applicable
File size8,951
Date (UTC)08-Mar-2016
Time (UTC)15:48
PlatformNot applicable
x64 Windows 8.1 and Windows Server 2012 R2
File propertyValue
File nameAmd64_f7be15b9659146794beb7361fa0acae1_31bf3856ad364e35_6.3.9600.18262_none_54cfd28aa31bf9c0.manifest
File versionNot applicable
File size701
Date (UTC)08-Mar-2016
Time (UTC)20:59
PlatformNot applicable
File nameAmd64_microsoft-windows-dfsclient_31bf3856ad364e35_6.3.9600.18262_none_786bfdb6ba04b6dd.manifest
File versionNot applicable
File size8,953
Date (UTC)08-Mar-2016
Time (UTC)15:57
PlatformNot applicable
File nameUpdate.mum
File versionNot applicable
File size1,593
Date (UTC)08-Mar-2016
Time (UTC)20:59
PlatformNot applicable
Windows RT 8.1
File propertyValue
File nameArm_ec31c864e4f8c2f85595b1ca30026705_31bf3856ad364e35_6.3.9600.18262_none_675a9307ad1ef431.manifest
File versionNot applicable
File size697
Date (UTC)08-Mar-2016
Time (UTC)20:59
PlatformNot applicable
File nameArm_microsoft-windows-dfsclient_31bf3856ad364e35_6.3.9600.18262_none_1c4fd48b01a4646d.manifest
File versionNot applicable
File size8,951
Date (UTC)08-Mar-2016
Time (UTC)15:30
PlatformNot applicable
File nameUpdate.mum
File versionNot applicable
File size1,585
Date (UTC)08-Mar-2016
Time (UTC)20:59
PlatformNot applicable
Properties

Article ID: 3146627 - Last Review: 04/20/2016 04:49:00 - Revision: 3.0

Windows Server 2012 R2 Datacenter, Windows Server 2012 R2 Standard, Windows Server 2012 R2 Essentials, Windows Server 2012 R2 Foundation, Windows 8.1 Enterprise, Windows 8.1 Pro, Windows 8.1, Windows RT 8.1

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