This article describes an issue that occurs when you use RDP to run a RemoteApp application in Windows Server 2012 R2. A hotfix is available to resolve this issue. The hotfix has a prerequisiteAdditional steps for configuration are required to enable this hotfix after the installation.

Symptoms

This issue occurs because the Dynamic dots per inch (DPI) sync setting for the remote desktop is not configurable. The Dynamic DPI sync feature automatically determines the DPI from the client side, and it ignores any server setting. Therefore, when the DPI of the client is much larger than the DPI of the server, this issue occurs. 

Note RDP represents Remote Desktop Protocol.

Resolution

To disable the feature, we have released a hotfix for Windows Server 2012 R2.

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.

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, submit a request to 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 website:

http://support.microsoft.com/contactus/?ws=supportNote 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

To apply this update, you must have update 2919355 installed in Windows Server 2012 R2.

Registry information

To enable this hotfix, follow these steps:

Important
Follow the steps in this section carefully. Serious problems might occur if you modify the registry incorrectly. Before you modify it, back up the registry for restoration in case problems occur.

  1. In Registry Editor, locate and then click the following registry subkey:

    HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Terminal Server\WinStations

  2. Right-click WinStations, click New, and then click DWORD (32-bit) Value.

  3. Name the new registry entry as IgnoreClientDesktopScaleFactor.

  4. Double-click the IgnoreClientDesktopScaleFactor registry entry.

  5. In the Edit DWORD Value dialog box, type 1 in the Value data field, and then click OK.

  6. Exit Registry Editor.

Notes 

  • To enable the Dynamic DPI sync feature, set the IgnoreClientDesktopScaleFactor registry entry value to 0, or delete the registry entry.

  • You have to restart the server after the registry is changed.

Restart requirement

You may have to restart the computer after you install this hotfix.

Hotfix replacement information

This hotfix does not replace a previously released hotfix.

The global version of this hotfix installs files that have the attributes that are listed in the following tables. The dates and the times for these files are listed in Coordinated Universal Time (UTC). The dates and the times for these files on your local computer are displayed in your local time together with your current daylight saving time (DST) bias. Additionally, the dates and the times may change when you perform certain operations on the files.

Windows Server 2012 R2 file information and notes

Important Windows 8.1 hotfixes and Windows Server 2012 R2 hotfixes are included in the same packages. However, hotfixes on the Hotfix Request page are listed under both operating systems. To request the hotfix package that applies to one or both operating systems, select the hotfix that is listed under "Windows 8.1/Windows Server 2012 R2" on the page. Always refer to the "Applies To" section in articles to determine the actual operating system that each hotfix applies to.

  • 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:

    Version

    Product

    Milestone

    Service branch

    6.3.960 0.17 xxx

    Windows Server 2012 R2

    RTM

    GDR

  • 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 separately 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.

For all supported x64-based versions of Windows Server 2012 R2

File name

File version

File size

Date

Time

Platform

Rdpcorets.dll

6.3.9600.17622

3,547,648

19-Dec-2014

00:50

x64

Rdpudd.dll

6.3.9600.17415

131,584

29-Oct-2014

02:48

x64

Rdpvideominiport.sys

6.3.9600.17415

27,456

29-Oct-2014

03:56

x64

Rfxvmt.dll

6.3.9600.17415

40,448

29-Oct-2014

02:37

x64

Additional file information

Additional file information for Windows Server 2012 R2

Additional files for all supported x64-based versions of Windows Server 2012 R2

File property

Value

File name

Amd64_7f31c3c950eaadb112a2991c886356f1_31bf3856ad364e35_6.3.9600.17622_none_a985a9fcee521c14.manifest

File version

Not applicable

File size

729

Date (UTC)

29-Dec-2014

Time (UTC)

23:31

Platform

Not applicable

File name

Amd64_microsoft-windows-r..s-regkeys-component_31bf3856ad364e35_6.3.9600.17622_none_208b588cdb9769c7.manifest

File version

Not applicable

File size

13,555

Date (UTC)

29-Dec-2014

Time (UTC)

23:31

Platform

Not applicable



Status

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

References

See the terminology that Microsoft uses to describe software updates.

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