This article describes an update that improves the Secure Channel (Schannel) for Windows 8.1, Windows RT 8.1, or Windows Server 2012 R2. Before you install this update, check out the Prerequisites section.

Symptoms

Before you install the update, Local Security Authority (LSA) crash issues may occur.

How to obtain this update

Important Do not install a language pack after you install this update. If you do, the language-specific changes in the update will not be applied, and you will have to reinstall the update. For more information, see Add language packs to Windows.

Method 1: Windows Update

This update is available from Windows Update.

Method 2: Microsoft Download Center

The following files are available for download from the Microsoft Download Center:

Operating system

Update

All supported x86-based versions of Windows 8.1

Download Download the package now.

All supported x64-based versions of Windows 8.1

Download Download the package now.

All supported x64-based versions of Windows Server 2012 R2

Download Download the package now.

Note The update for Windows RT 8.1 can be obtained only from Windows Update.

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 install 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 do not 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 does not 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 8.1 and 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 0.17 xxx

    Windows RT 8.1, Windows 8.1, and 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 x86-based versions of Windows 8.1

File name

File version

File size

Date

Time

Platform

Schannel.dll

6.3.9600.17728

358,912

13-Mar-2015

02:38

x86

For all supported x64-based versions of Windows 8.1 or Windows Server 2012 R2

File name

File version

File size

Date

Time

Platform

Schannel.dll

6.3.9600.17728

430,080

13-Mar-2015

02:59

x64

Schannel.dll

6.3.9600.17728

358,912

13-Mar-2015

02:38

x86

For all supported Windows RT 8.1

File name

File version

File size

Date

Time

Platform

Schannel.dll

6.3.9600.17728

307,712

13-Mar-2015

02:18

Not applicable


Additional file information


Additional file information for Windows 8.1 and for Windows Server 2012 R2


Additional files for all supported x86-based versions of Windows 8.1

File property

Value

File name

X86_023b38e1bd01d2ca0726d2a82e0b1d17_31bf3856ad364e35_6.3.9600.17728_none_e903fd74d9cc881b.manifest

File version

Not applicable

File size

705

Date (UTC)

13-Mar-2015

Time (UTC)

14:48

Platform

Not applicable

File name

X86_microsoft-windows-security-schannel_31bf3856ad364e35_6.3.9600.17728_none_b6fae11570a837f2.manifest

File version

Not applicable

File size

13,286

Date (UTC)

13-Mar-2015

Time (UTC)

04:50

Platform

Not applicable


Additional files for all supported x64-based versions of Windows 8.1 and of Windows Server 2012 R2

File property

Value

File name

Amd64_12e94e7dd5cf5222acb061c9c42c7c14_31bf3856ad364e35_6.3.9600.17728_none_bb043d435aa04ed2.manifest

File version

Not applicable

File size

709

Date (UTC)

13-Mar-2015

Time (UTC)

14:48

Platform

Not applicable

File name

Amd64_f4e0bf67139a362695c433eb74409eb7_31bf3856ad364e35_6.3.9600.17728_none_13fadfb51ce12a83.manifest

File version

Not applicable

File size

709

Date (UTC)

13-Mar-2015

Time (UTC)

14:48

Platform

Not applicable

File name

Amd64_microsoft-windows-security-schannel_31bf3856ad364e35_6.3.9600.17728_none_13197c992905a928.manifest

File version

Not applicable

File size

13,290

Date (UTC)

13-Mar-2015

Time (UTC)

05:42

Platform

Not applicable

File name

Wow64_microsoft-windows-security-schannel_31bf3856ad364e35_6.3.9600.17728_none_1d6e26eb5d666b23.manifest

File version

Not applicable

File size

7,312

Date (UTC)

13-Mar-2015

Time (UTC)

04:50

Platform

Not applicable


Additional files for all supported Windows RT 8.1

File property

Value

File name

Arm_0ff9ee4b506c3ab1b9d483bbc7309e3e_31bf3856ad364e35_6.3.9600.17728_none_060c5ec1de600d45.manifest

File version

Not applicable

File size

705

Date (UTC)

13-Mar-2015

Time (UTC)

14:48

Platform

Not applicable

File name

Arm_microsoft-windows-security-schannel_31bf3856ad364e35_6.3.9600.17728_none_b6fd536d70a556b8.manifest

File version

Not applicable

File size

13,286

Date (UTC)

13-Mar-2015

Time (UTC)

03:49

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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