DNS client API call fails and could lead to service restart freeze in Windows Server 2012 R2 or Windows Server 2012

This article describes a problem in which DNS client API call fails and could lead to service restart freeze in Windows Server 2012 R2 or Windows Server 2012. An update is available to fix this issue. Before you install this update, see the Prerequisites section.
Symptoms
This issue might occur when an application makes a call to the DNS client service. This creates a remote procedure call (RPC) to the DNS client service. The RPC binding might time out when multiple DNS queries are sent from applications. Therefore, the RPC call fails because of binding time-out and applications don't get responses from the DNS client service. When this happens during a service restart, it could cause service startup freeze. 
Cause
This problem occurs because the time-out value is hardcoded incorrectly.
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 provided as a Recommended update on Windows Update. For more information on how to run Windows Update, see How to get an update through Windows Update.

Method 2: Microsoft Download Center

The following files are available for download from the Microsoft Download Center.
Operating systemUpdate
All supported x64-based versions of Windows Server 2012 R2DownloadDownload the package now.
All supported x64-based versions of Windows Server 2012DownloadDownload the package now.


For more information about how to download Microsoft support files, select 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, install April 2014, update rollup for Windows RT 8.1, Windows 8.1, and Windows Server 2012 R2 (2919355) in Windows 8.1 or Windows Server 2012 R2.

Registry information

To apply 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.
Status
Microsoft has confirmed that this's 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 Server 2012 R2

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 0.18xxxWindows 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.
x64 Windows Server 2012 R2
File nameFile versionFile sizeDateTimePlatform
Dnsapi.dll6.3.9600.18192657,92010-Jan-201617:09x64
Dnsrslvr.dll6.3.9600.18192252,41610-Jan-201617:08x64
Dnsapi.dll6.3.9600.18192498,68810-Jan-201616:46x86

Windows Server 2012

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
    6.2.920 0.17xxxWindows Server 2012RTMGDR
    6.2.920 0.21xxxWindows Server 2012RTMLDR
  • 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.
x64 Windows Server 2012
File nameFile versionFile sizeDateTimePlatform
Dnsapi.dll6.2.9200.17623623,61610-Jan-201615:40x64
Dnsrslvr.dll6.2.9200.17623212,99210-Jan-201615:40x64
Dnsapi.dll6.2.9200.21743606,20810-Jan-201602:24x64
Dnsrslvr.dll6.2.9200.21743210,94410-Jan-201602:24x64
Dnsapi.dll6.2.9200.17623458,75210-Jan-201612:04x86
Dnsapi.dll6.2.9200.21743462,33610-Jan-201600:12x86

Additional file information

x64 Windows Server 2012 R2
File propertyValue
File nameAmd64_12c1b999a98c1d2a21b6a3061da2d04d_31bf3856ad364e35_6.3.9600.18192_none_00ae2a16f1cbb17a.manifest
File versionNot applicable
File size709
Date (UTC)11-Jan-2016
Time (UTC)22:54
PlatformNot applicable
File nameAmd64_b95b552e78c979385718226cdb987905_31bf3856ad364e35_6.3.9600.18192_none_894962ad6b6de733.manifest
File versionNot applicable
File size709
Date (UTC)11-Jan-2016
Time (UTC)22:54
PlatformNot applicable
File nameAmd64_microsoft-windows-dns-client-minwin_31bf3856ad364e35_6.3.9600.18192_none_863d11eef726c291.manifest
File versionNot applicable
File size22,733
Date (UTC)10-Jan-2016
Time (UTC)19:36
PlatformNot applicable
File nameUpdate.mum
File versionNot applicable
File size2,227
Date (UTC)11-Jan-2016
Time (UTC)22:54
PlatformNot applicable
File nameWow64_microsoft-windows-dns-client-minwin_31bf3856ad364e35_6.3.9600.18192_none_9091bc412b87848c.manifest
File versionNot applicable
File size18,789
Date (UTC)10-Jan-2016
Time (UTC)18:35
PlatformNot applicable
x64 Windows Server 2012
File propertyValue
File nameAmd64_2034c65aabc1283d1323c3dbefec7dac_31bf3856ad364e35_6.2.9200.17623_none_b9783a91ed99ad1e.manifest
File versionNot applicable
File size709
Date (UTC)11-Jan-2016
Time (UTC)23:11
PlatformNot applicable
File nameAmd64_d7548dc0d892001f1729114c69d8c1a1_31bf3856ad364e35_6.2.9200.21743_none_1c96417f9111e3bf.manifest
File versionNot applicable
File size709
Date (UTC)11-Jan-2016
Time (UTC)23:11
PlatformNot applicable
File nameAmd64_f76bd2ba8ef9de254720996f23b60fd1_31bf3856ad364e35_6.2.9200.21743_none_ec921bcb9e1beb20.manifest
File versionNot applicable
File size709
Date (UTC)11-Jan-2016
Time (UTC)23:11
PlatformNot applicable
File nameAmd64_ff23fa7abde2b023dd48b9e345d9c99d_31bf3856ad364e35_6.2.9200.17623_none_0ddd97e9bb48f083.manifest
File versionNot applicable
File size709
Date (UTC)11-Jan-2016
Time (UTC)23:11
PlatformNot applicable
File nameAmd64_microsoft-windows-dns-client-minwin_31bf3856ad364e35_6.2.9200.17623_none_ee95294cacba1ff6.manifest
File versionNot applicable
File size22,070
Date (UTC)10-Jan-2016
Time (UTC)16:09
PlatformNot applicable
File nameAmd64_microsoft-windows-dns-client-minwin_31bf3856ad364e35_6.2.9200.21743_none_ef09263fc5e7f7a2.manifest
File versionNot applicable
File size22,070
Date (UTC)10-Jan-2016
Time (UTC)02:50
PlatformNot applicable
File nameUpdate.mum
File versionNot applicable
File size2,228
Date (UTC)11-Jan-2016
Time (UTC)23:11
PlatformNot applicable
File nameWow64_microsoft-windows-dns-client-minwin_31bf3856ad364e35_6.2.9200.17623_none_f8e9d39ee11ae1f1.manifest
File versionNot applicable
File size18,372
Date (UTC)10-Jan-2016
Time (UTC)12:25
PlatformNot applicable
File nameWow64_microsoft-windows-dns-client-minwin_31bf3856ad364e35_6.2.9200.21743_none_f95dd091fa48b99d.manifest
File versionNot applicable
File size18,372
Date (UTC)10-Jan-2016
Time (UTC)00:42
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: 3134242 - Last Review: 03/30/2016 03:18:00 - Revision: 4.0

Windows Server 2012 R2 Datacenter, Windows Server 2012 R2 Standard, Windows Server 2012 R2 Essentials, Windows Server 2012 R2 Foundation, Windows Server 2012 Datacenter, Windows Server 2012 Standard, Windows Server 2012 Essentials, Windows Server 2012 Foundation

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