Symptoms

Consider the following scenario:

  • You have a computer that is running Windows Server 2008 R2.

  • You install the Domain Name System (DNS) server role on the computer.

  • The DNS Server service is under a heavy load situation.

In this scenario, the performance of the DNS Server service decreases with time. To recover from this issue, you have to restart the DNS Server service.

Note If you monitor the following performance counters when the issue occurs, you find that the values of these counters keep dropping:

DNS\Total Query Received/sec

DNS\Total Response Sent/sec

Cause

The issue occurs because of a memory leak issue in the DNS Server service.

Resolution

Hotfix information

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 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, 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.

Registry information

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

Prerequisites

To apply this hotfix, you must be running Windows Server 2008 R2 or Windows Server 2008 R2 Service Pack 1 (SP1).
For more information about how to obtain a Windows 7 or a Windows Server 2008 R2 service pack, click the following article number to view the article in the Microsoft Knowledge Base:

976932 Information about Service Pack 1 for Windows 7 and for Windows Server 2008 R2

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.

File information

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 Server 2008 R2 file information notes

Important Windows 7 hotfixes and Windows Server 2008 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 7/Windows Server 2008 R2" 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, SR_Level (RTM, SPn), and service branch (LDR, GDR) can be identified by examining the file version numbers as shown in the following table.

    Version

    Product

    SR_Level

    Service branch

    6.1.760
    0.
    20xxx

    Windows Server 2008 R2

    RTM

    LDR

    6.1.760
    1.
    21xxx

    Windows Server 2008 R2

    SP1

    LDR

  • 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 2008 R2" section.┬áMUM 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 2008 R2

File name

File version

File size

Date

Time

Platform

Cache.dns

Not Applicable

3,198

10-Jun-2009

20:31

Not Applicable

Dns.exe

6.1.7600.20931

696,320

23-Mar-2011

05:07

x64

Dnsserver.events.xml

Not Applicable

609

10-Jun-2009

20:31

Not Applicable

Cache.dns

Not Applicable

3,198

05-Nov-2010

01:52

Not Applicable

Dns.exe

6.1.7601.21690

696,832

23-Mar-2011

05:13

x64

Dnsserver.events.xml

Not Applicable

609

05-Nov-2010

01:52

Not Applicable

Status

Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.

More Information

For more information about software update terminology, click the following article number to view the article in the Microsoft Knowledge Base:

824684 Description of the standard terminology that is used to describe Microsoft software updates

Additional file information

Additional file information for Windows Server 2008 R2

Additional files for all supported x64-based versions of Windows Server 2008 R2

File name

Amd64_7dbbbd6d9167b27ec003f56888667c61_31bf3856ad364e35_6.1.7601.21690_none_f199c82aefb81b0a.manifest

File version

Not Applicable

File size

710

Date (UTC)

23-Mar-2011

Time (UTC)

13:12

Platform

Not Applicable

File name

Amd64_9055a3ed74294897e329fe9e7c26ee15_31bf3856ad364e35_6.1.7600.20931_none_462262644281c148.manifest

File version

Not Applicable

File size

710

Date (UTC)

23-Mar-2011

Time (UTC)

13:12

Platform

Not Applicable

File name

Amd64_microsoft-windows-dns-server-service_31bf3856ad364e35_6.1.7600.20931_none_aab68bda093e402e.manifest

File version

Not Applicable

File size

158,131

Date (UTC)

23-Mar-2011

Time (UTC)

06:04

Platform

Not Applicable

File name

Amd64_microsoft-windows-dns-server-service_31bf3856ad364e35_6.1.7601.21690_none_ac5b072806963d42.manifest

File version

Not Applicable

File size

158,131

Date (UTC)

23-Mar-2011

Time (UTC)

05:47

Platform

Not Applicable

File name

Update.mum

File version

Not Applicable

File size

2,363

Date (UTC)

23-Mar-2011

Time (UTC)

13:12

Platform

Not Applicable

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