This article describes an issue in which a Domain Name System (DNS) server freezes and doesn't respond to DNS requests in Windows Server 2012 R2. A hotfix is available to fix this issue. Before you install this hotfix, see the Prerequisites section.

Symptoms

Assume that you're running Microsoft DNS Services on Windows Server 2012 R2-based computers in an Active Directory Forest. You notice that the DNS service on Windows Server 2012 R2-based DNS servers consumes increasing amounts of memory, and then memory leak occurs.

Additionally, the memory leaks by DNS may affect the performance of other components, services, and applications that are running on the same computer.

The Dnscmd cmdlet may show a signature that looks something like this:Tagged Allocations:
None
Alloc = 8
Free = 7
InUse = 1
Mem = 160
UDP Packet
Alloc = 922979
Free = 513189
InUse = 409,790
Mem = 2,966,879,600
TCP Packet
Alloc = 2789088
Free = 2624289
InUse = 164799 Note If there're lots of UDP or TCP packages, you may hit the leak.

Resolution

To fix this issue, we have released a hotfix for Windows Server 2012 R2.

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:

http://support.microsoft.com/contactus/?ws=supportNote 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, install update 2919355 in Windows Server 2012 R2.

Registry information

To use the hotfix in this package, 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

See 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.

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 0.18 xxx

    Windows Server 2012 R2

    RTM

    GDR

  • 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 name

File version

File size

Date

Time

Platform

Cache.dns

Not applicable

3,198

18-Jun-2013

14:43

Not applicable

Dns.exe

6.3.9600.18008

1,734,656

08-Aug-2015

14:14

x64

Dnsserver.events.xml

Not applicable

609

18-Jun-2013

14:43

Not applicable


x64 Windows Server 2012 R2

File property

Value

File name

Amd64_04c78c569beac349dca8e52765d29bef_31bf3856ad364e35_6.3.9600.18008_none_0e55fcbd787da4b8.manifest

File version

Not applicable

File size

718

Date (UTC)

08-Aug-2015

Time (UTC)

23:09

Platform

Not applicable

File name

Amd64_4db7a0f98c7042649ed1f573691fdd59_31bf3856ad364e35_6.3.9600.18008_none_3759dd595e0d92f3.manifest

File version

Not applicable

File size

718

Date (UTC)

08-Aug-2015

Time (UTC)

23:09

Platform

Not applicable

File name

Amd64_63b625e920536029524831e0ae990555_31bf3856ad364e35_6.3.9600.18008_none_59c148583e51a014.manifest

File version

Not applicable

File size

718

Date (UTC)

08-Aug-2015

Time (UTC)

23:09

Platform

Not applicable

File name

Amd64_6eb8ae0db833e5a99e2adb16229b1009_31bf3856ad364e35_6.3.9600.18008_none_2d96265855ab264c.manifest

File version

Not applicable

File size

718

Date (UTC)

08-Aug-2015

Time (UTC)

23:09

Platform

Not applicable

File name

Amd64_6edaf298616656cfcc06d7945d4951dc_31bf3856ad364e35_6.3.9600.18008_none_8d8db909237fec3f.manifest

File version

Not applicable

File size

718

Date (UTC)

08-Aug-2015

Time (UTC)

23:09

Platform

Not applicable

File name

Amd64_7b0bc32e737f15f6bd6569868284fe4a_31bf3856ad364e35_6.3.9600.18008_none_12c3468113280ded.manifest

File version

Not applicable

File size

718

Date (UTC)

08-Aug-2015

Time (UTC)

23:09

Platform

Not applicable

File name

Amd64_9e57b761929e99418ac312a8af96e3fa_31bf3856ad364e35_6.3.9600.18008_none_1d1f9a4243c57558.manifest

File version

Not applicable

File size

718

Date (UTC)

08-Aug-2015

Time (UTC)

23:09

Platform

Not applicable

File name

Amd64_a21183cf40ef54c487dec27f583e4f21_31bf3856ad364e35_6.3.9600.18008_none_c80a9c0d2c3e426a.manifest

File version

Not applicable

File size

710

Date (UTC)

08-Aug-2015

Time (UTC)

23:09

Platform

Not applicable

File name

Amd64_c09587525c1136785e7db949df5a236b_31bf3856ad364e35_6.3.9600.18008_none_e6781fcbaf252e57.manifest

File version

Not applicable

File size

718

Date (UTC)

08-Aug-2015

Time (UTC)

23:09

Platform

Not applicable

File name

Amd64_ce22500a2db3da4e94d2cca03b084637_31bf3856ad364e35_6.3.9600.18008_none_53280313ccda2542.manifest

File version

Not applicable

File size

718

Date (UTC)

08-Aug-2015

Time (UTC)

23:09

Platform

Not applicable

File name

Amd64_cf99b57eddb41e78fd52831e8a663723_31bf3856ad364e35_6.3.9600.18008_none_ae126ae5246bfbc1.manifest

File version

Not applicable

File size

718

Date (UTC)

08-Aug-2015

Time (UTC)

23:09

Platform

Not applicable

File name

Amd64_e2892c63749df43c186b90c47e3c9f36_31bf3856ad364e35_6.3.9600.18008_none_8a4764c0411c5635.manifest

File version

Not applicable

File size

718

Date (UTC)

08-Aug-2015

Time (UTC)

23:09

Platform

Not applicable

File name

Amd64_fe922e59ad6056b204ce5ff6ad8c4dd7_31bf3856ad364e35_6.3.9600.18008_none_e316343599071b9b.manifest

File version

Not applicable

File size

718

Date (UTC)

08-Aug-2015

Time (UTC)

23:09

Platform

Not applicable

File name

Amd64_microsoft-windows-d..r-service.resources_31bf3856ad364e35_6.3.9600.18008_de-de_a431c36a4f0fc894.manifest

File version

Not applicable

File size

2,476

Date (UTC)

08-Aug-2015

Time (UTC)

23:09

Platform

Not applicable

File name

Amd64_microsoft-windows-d..r-service.resources_31bf3856ad364e35_6.3.9600.18008_en-us_4d2299633dedd459.manifest

File version

Not applicable

File size

2,476

Date (UTC)

08-Aug-2015

Time (UTC)

23:09

Platform

Not applicable

File name

Amd64_microsoft-windows-d..r-service.resources_31bf3856ad364e35_6.3.9600.18008_es-es_4cedf6473e14c5fe.manifest

File version

Not applicable

File size

2,476

Date (UTC)

08-Aug-2015

Time (UTC)

23:09

Platform

Not applicable

File name

Amd64_microsoft-windows-d..r-service.resources_31bf3856ad364e35_6.3.9600.18008_fr-fr_efa56c4630e6dc60.manifest

File version

Not applicable

File size

2,476

Date (UTC)

08-Aug-2015

Time (UTC)

23:09

Platform

Not applicable

File name

Amd64_microsoft-windows-d..r-service.resources_31bf3856ad364e35_6.3.9600.18008_it-it_d9cd628d0818c1de.manifest

File version

Not applicable

File size

2,476

Date (UTC)

08-Aug-2015

Time (UTC)

23:09

Platform

Not applicable

File name

Amd64_microsoft-windows-d..r-service.resources_31bf3856ad364e35_6.3.9600.18008_ja-jp_7bf2e199fb33d3b9.manifest

File version

Not applicable

File size

2,476

Date (UTC)

08-Aug-2015

Time (UTC)

23:09

Platform

Not applicable

File name

Amd64_microsoft-windows-d..r-service.resources_31bf3856ad364e35_6.3.9600.18008_ko-kr_1f5cbe4eeda49acf.manifest

File version

Not applicable

File size

2,476

Date (UTC)

08-Aug-2015

Time (UTC)

23:09

Platform

Not applicable

File name

Amd64_microsoft-windows-d..r-service.resources_31bf3856ad364e35_6.3.9600.18008_pt-br_4ebecfe7aaa1d1f8.manifest

File version

Not applicable

File size

2,476

Date (UTC)

08-Aug-2015

Time (UTC)

23:09

Platform

Not applicable

File name

Amd64_microsoft-windows-d..r-service.resources_31bf3856ad364e35_6.3.9600.18008_ru-ru_9643b1178ef2d000.manifest

File version

Not applicable

File size

2,476

Date (UTC)

08-Aug-2015

Time (UTC)

23:09

Platform

Not applicable

File name

Amd64_microsoft-windows-d..r-service.resources_31bf3856ad364e35_6.3.9600.18008_zh-cn_aca903d1250fae6b.manifest

File version

Not applicable

File size

2,476

Date (UTC)

08-Aug-2015

Time (UTC)

23:09

Platform

Not applicable

File name

Amd64_microsoft-windows-d..r-service.resources_31bf3856ad364e35_6.3.9600.18008_zh-hk_ab53fc5f25eb20fb.manifest

File version

Not applicable

File size

2,476

Date (UTC)

08-Aug-2015

Time (UTC)

23:09

Platform

Not applicable

File name

Amd64_microsoft-windows-d..r-service.resources_31bf3856ad364e35_6.3.9600.18008_zh-tw_b0a5412722808adb.manifest

File version

Not applicable

File size

2,476

Date (UTC)

08-Aug-2015

Time (UTC)

23:09

Platform

Not applicable

File name

Amd64_microsoft-windows-dns-server-service_31bf3856ad364e35_6.3.9600.18008_none_3f1e92c6aa476120.manifest

File version

Not applicable

File size

287,181

Date (UTC)

08-Aug-2015

Time (UTC)

16:29

Platform

Not applicable

File name

Update.mum

File version

Not applicable

File size

16,897

Date (UTC)

08-Aug-2015

Time (UTC)

23:09

Platform

Not applicable


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