IIS returns multiple content-length headers in Windows 8.1 or Windows Server 2012 R2

This article describes an issue that occurs on a Windows 8.1 or Windows Server 2012 R2-based computer that's running Internet Information Services (IIS). A hotfix is available to fix this issue. The hotfix has a prerequisite.
Symptoms
Assume that you're using a Dynamic Adaptive Streaming over HTTP (DASH) player in a web browser. When the browser performs a byte-range request, IIS returns a double content-length header: one header contains the length of the entire (cached) object and the other contains the requested byte-range. Therefore, the DASH video player fails in the browser.
Hotfix information
Important If you install a language pack after you install this hotfix, you must reinstall this hotfix. Therefore, we recommend that you install any language packs that you need before you install this 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's described in this article. Apply this hotfix only to systems that are experiencing this specific problem.

If the hotfix is available for download, there's a "Hotfix Download Available" section at the top of this Knowledge Base article. If this section doesn't appear, submit a request to Microsoft Customer Service and Support to get 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 don't 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: Note The "Hotfix Download Available" form displays the languages for which the hotfix is available. If you don't see your language, it's because a hotfix isn't available for that language.

Prerequisites

To apply this hotfix, 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 hotfix, you don't 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 doesn't replace a previously released hotfix.
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 and Windows Server 2012 R2

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.

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 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
Hwebcore.dll8.5.9600.1818315,36028-Dec-201520:36x86
Iiscore.dll8.5.9600.18183235,00828-Dec-201520:34x86
W3dt.dll8.5.9600.18183100,35228-Dec-201520:36x86
x64 Windows 8.1 and Windows Server 2012 R2
File nameFile versionFile sizeDateTimePlatform
Hwebcore.dll8.5.9600.1818317,40828-Dec-201521:49x64
Iiscore.dll8.5.9600.18183337,92028-Dec-201521:47x64
W3dt.dll8.5.9600.18183111,10428-Dec-201521:53x64
Hwebcore.dll8.5.9600.1818315,36028-Dec-201520:36x86
Iiscore.dll8.5.9600.18183235,00828-Dec-201520:34x86
W3dt.dll8.5.9600.18183100,35228-Dec-201520:36x86

Additional file information

x86 Windows 8.1
File propertyValue
File nameUpdate.mum
File versionNot applicable
File size1,999
Date (UTC)30-Dec-2015
Time (UTC)21:29
PlatformNot applicable
File nameX86_5eb5b0122dcdf14bbd86124444fa9007_31bf3856ad364e35_6.3.9600.18185_none_41440f91201ae492.manifest
File versionNot applicable
File size713
Date (UTC)30-Dec-2015
Time (UTC)21:29
PlatformNot applicable
File nameX86_microsoft-windows-i..rewebenginebinaries_31bf3856ad364e35_6.3.9600.18185_none_29a4bead41865bdb.manifest
File versionNot applicable
File size6,937
Date (UTC)30-Dec-2015
Time (UTC)15:24
PlatformNot applicable
x64 Windows 8.1 and Windows Server 2012 R2
File propertyValue
File nameAmd64_55fea2c0c624b448f124f855c6e047ff_31bf3856ad364e35_6.3.9600.18185_none_a1fc10612aeb043c.manifest
File versionNot applicable
File size717
Date (UTC)30-Dec-2015
Time (UTC)21:29
PlatformNot applicable
File nameAmd64_be2f43d1c64fe0212a494bc711ad4652_31bf3856ad364e35_6.3.9600.18185_none_2ee5514ad90b2b8e.manifest
File versionNot applicable
File size717
Date (UTC)30-Dec-2015
Time (UTC)21:29
PlatformNot applicable
File nameAmd64_microsoft-windows-i..rewebenginebinaries_31bf3856ad364e35_6.3.9600.18185_none_85c35a30f9e3cd11.manifest
File versionNot applicable
File size6,943
Date (UTC)30-Dec-2015
Time (UTC)15:34
PlatformNot applicable
File nameUpdate.mum
File versionNot applicable
File size2,444
Date (UTC)30-Dec-2015
Time (UTC)21:29
PlatformNot applicable
File nameWow64_microsoft-windows-i..rewebenginebinaries_31bf3856ad364e35_6.3.9600.18185_none_901804832e448f0c.manifest
File versionNot applicable
File size6,062
Date (UTC)30-Dec-2015
Time (UTC)15:24
PlatformNot applicable
Note This is a "FAST PUBLISH" article created directly from within the Microsoft support organization. The information contained herein is provided as-is in response to emerging issues. As a result of the speed in making it available, the materials may include typographical errors and may be revised at any time without notice. See Terms of Use for other considerations.
Properties

Article ID: 3093271 - Last Review: 02/22/2016 03:02:00 - Revision: 2.0

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

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