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Heavy network traffic occurs during an LDAP query by the DNS server in Windows Server 2012 R2 and Windows Server 2012

Consider the following scenario:
In this scenario, heavy network traffic may be observed from the DNS server to the domain naming master server because of a large number of Lightweight Directory Access Protocol (LDAP) queries. Additionally, you may find that the LDAP query is actually for the DNS Settings object that contains the msDNS-KeymasterZones attribute.
This problem occurs because the new DNSSEC feature in Windows Server 2012 tries to query the Domain Naming Master for the msDNS-KeymasterZones attribute every minute for all AD integrated zones on the DNS server.
To resolve this issue in Windows Server 2012 R2, install update 2919355.
To resolve this issue in Windows Server 2012, install the hotfix that is described in this article.

Update information for Windows Server 2012 R2

For more information about how to obtain update 2919355, click the following article number to view the article in the Microsoft Knowledge Base:
2919355 Windows RT 8.1, Windows 8.1, and Windows Server 2012 R2 Update April, 2014

Hotfix information for Windows Server 2012

A supported hotfix is available from Microsoft Support. 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 the problem described in this article. This hotfix might receive additional testing. Therefore, if you are not severely affected by this problem, we recommend that you wait for the next software update that contains this hotfix.

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, contact 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, go to the following Microsoft website: Note 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.


To apply this hotfix, you must have Windows Server 2012 installed.

Restart requirement

You do not have to restart the computer after you apply this hotfix.

Hotfix replacement information

This hotfix does not replace any previously released hotfix.

File information

The English (United States) 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 and Windows Server 2012 hotfixes are included in the same packages. However, only "Windows 8" is listed on the Hotfix Request page. To request the hotfix package that applies to one or both operating systems, select the hotfix that is listed under "Windows 8" 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.
    VersionProductMilestoneService branch
    6.2.920 0.20xxxWindows Server 2012RTMLDR
  • The MANIFEST files (.manifest) and the MUM files (.mum) that are installed for each environment are listed separately in the "Additional file information for Windows Server 2012" section. MUM and MANIFEST files, and the associated security catalog (.cat) files, are extremely 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 x64-based versions of Windows Server 2012
File nameFile versionFile sizeDateTimePlatform
Cache.dnsNot Applicable3,19802-Jun-201214:30Not Applicable
Dns.exe6.2.9200.209021,536,00023-Dec-201323:30x64 Applicable60902-Jun-201214:30Not Applicable
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.

Additional file information

Additional file information for Windows Server 2012

Additional files for all supported x64-based versions of Windows Server 2012
File nameAmd64_df07979af188f8501204f5cca388431d_31bf3856ad364e35_6.2.9200.20902_none_d65ef0bcf8eee61a.manifest
File versionNot Applicable
File size710
Date (UTC)24-Dec-2013
Time (UTC)09:02
PlatformNot Applicable
File nameAmd64_microsoft-windows-dns-server-service_31bf3856ad364e35_6.2.9200.20902_none_a7adb1ef79374e59.manifest
File versionNot Applicable
File size184,291
Date (UTC)24-Dec-2013
Time (UTC)02:12
PlatformNot Applicable
File namePackage_1_for_kb2910718~31bf3856ad364e35~amd64~~
File versionNot Applicable
File size1,832
Date (UTC)24-Dec-2013
Time (UTC)09:02
PlatformNot Applicable
File namePackage_for_kb2910718_rtm~31bf3856ad364e35~amd64~~
File versionNot Applicable
File size1,460
Date (UTC)24-Dec-2013
Time (UTC)09:02
PlatformNot Applicable
Learn about the terminology that Microsoft uses to describe software updates.

Article ID: 2910718 - Last Review: 04/10/2014 03:48:00 - Revision: 1.1

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

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