Performance improvement for WinHTTP when lots of HTTP requests are received in Windows 8 or Windows Server 2012

About this hotfix

This hotfix fixes a rare deadlock between WinHTTP and LSASS. This deadlock happens when WinHTTP handles lots of concurrent requests and consumes all the system threads.

Hotfix information

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

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

There is no prerequisite to apply this hotfix.

Registry information

To use the hotfix in this package, you do not have to make any changes to the registry.

Restart requirement

You may have to restart the computer after you apply 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 8 and Windows Server 2012 file information and notes

Important Windows 8 hotfixes and Windows Server 2012 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/Windows Server 2012" 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

    6.2.920 0.21xxx

    Windows 8 and Windows Server 2012

    RTM

    LDR

  • 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

File name

File version

File size

Date

Time

Platform

Webio.dll

6.2.9200.21425

416,768

12-Mar-2015

03:16

x86

For all supported x64-based versions of Windows 8 and of Windows Server 2012

File name

File version

File size

Date

Time

Platform

Webio.dll

6.2.9200.21425

587,264

12-Mar-2015

04:09

x64

Webio.dll

6.2.9200.21425

416,768

12-Mar-2015

03:16

x86

Additional file information

Additional file information for Windows 8 and for Windows Server 2012

Additional files for all supported x86-based versions of Windows 8

File property

Value

File name

X86_0f514fa93c19a3656b1572cc965f0a9b_31bf3856ad364e35_6.2.9200.21425_none_3a8fb678dda257c8.manifest

File version

Not applicable

File size

693

Date (UTC)

12-Mar-2015

Time (UTC)

21:51

Platform

Not applicable

File name

X86_microsoft-windows-webio_31bf3856ad364e35_6.2.9200.21425_none_5a60abd3c9062a59.manifest

File version

Not applicable

File size

2,523

Date (UTC)

12-Mar-2015

Time (UTC)

03:42

Platform

Not applicable

Additional files for all supported x64-based versions of Windows 8 and of Windows Server 2012

File property

Value

File name

Amd64_33261e7500b492b33195d5a015470f60_31bf3856ad364e35_6.2.9200.21425_none_3f9cc4f571f1e813.manifest

File version

Not applicable

File size

697

Date (UTC)

12-Mar-2015

Time (UTC)

21:51

Platform

Not applicable

File name

Amd64_ddec53edee9cef0c06b0f3b64f1021eb_31bf3856ad364e35_6.2.9200.21425_none_a5b978c1a3c6dabf.manifest

File version

Not applicable

File size

697

Date (UTC)

12-Mar-2015

Time (UTC)

21:51

Platform

Not applicable

File name

Amd64_microsoft-windows-webio_31bf3856ad364e35_6.2.9200.21425_none_b67f475781639b8f.manifest

File version

Not applicable

File size

2,527

Date (UTC)

12-Mar-2015

Time (UTC)

06:06

Platform

Not applicable

File name

Wow64_microsoft-windows-webio_31bf3856ad364e35_6.2.9200.21425_none_c0d3f1a9b5c45d8a.manifest

File version

Not applicable

File size

2,525

Date (UTC)

12-Mar-2015

Time (UTC)

03:41

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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