This article describes an issue that occurs in Windows Server 2012 R2 that has Windows Deployment Services (WDS) installed. You can fix this issue by using the update in this article. Before you install this update, check out theĀ Prerequisites section.

Symptoms

This issue occurs when many client computers try to start over Trivial File Transfer Protocol (TFTP) on a multi-core system. Instead of using multiple CPU cores, all WDS threads are spinning at a high CPU usage, and TFTP transfers slow down to the point of start timeouts.

How to get this update

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 available on Windows Update. For more information about how to run Windows Update, see How to get an update through Windows Update.

Method 2: Microsoft Download Center

The following file is available for download from the Microsoft Download Center:

Download Download the update for Windows Server 2012 R2 package now.

For more information about how to download Microsoft support files, click the following article number to view the article in the Microsoft Knowledge Base:

119591 How to obtain Microsoft support files from online services Microsoft scanned this file for viruses. Microsoft used the most current virus-detection software that was available on the date that the file was posted. The file is stored on security-enhanced servers that help prevent any unauthorized changes to the file.

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 Server 2012 R2.

Registry information

To install 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.

The global version of this update 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

  • 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 0.17xxx

    Windows Server 2012 R2

    RTM

    GDR

  • 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 aren't 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

Wdstftp.dll

6.3.9600.17995

477,184

24-Jul-2015

17:51

x64

Wdstftpctr.h

Not applicable

880

18-Jun-2013

15:08

Not applicable

Wdstftpctr.ini

Not applicable

3,844

18-Jun-2013

15:08

Not applicable

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_b58e35238ea67f1df0e72f1dd431434e_31bf3856ad364e35_6.3.9600.17998_none_7efc9ecc04cbaf1f.manifest

File version

Not applicable

File size

723

Date (UTC)

29-Jul-2015

Time (UTC)

20:52

Platform

Not applicable

File name

Amd64_microsoft-windows-d..ervices-tftp-server_31bf3856ad364e35_6.3.9600.17998_none_06da453507e7acef.manifest

File version

Not applicable

File size

14,483

Date (UTC)

28-Jul-2015

Time (UTC)

16:50

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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