The DNS Server service does not respond to multi-label name resolution request correctly when background zone loading occurs in Windows Server 2008 R2

Symptoms

Consider the following scenario:

  • You install the Domain Name System (DNS) Server role on a computer that is running Windows Server 2008 R2.

  • You create a large DNS zone on the computer. The background zone loading feature is used to load the DNS zone.

  • You restart the DNS Server service or the computer.

  • You send a multi-label name resolution request for an existing name to the DNS zone immediately after the DNS Server service restarts.

In this scenario, the DNS Server service does not resolve the name resolution request. However, the related record exists in the DNS zone.

For example, you try to resolve the "a.b.contoso.com" name from the "contoso.com" zone. In this scenario, the DNS Server service does not retrieve the record that is not yet loaded from Active Directory Domain Services (AD DS). Therefore, the DNS Server service sends a "no such name" response.

Note This issue occurs only when the DNS Server service loads the DNS zone. This issue does not occur after the zone is loaded.

Cause

This issue occurs because the DNS Server service handles multi-label name resolution request incorrectly when the background zone loading feature is used to load the DNS zone.

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 Web site:

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.

Prerequisites

To apply this hotfix, you must be running Windows Server 2008 R2. Additionally, you must have the DNS Server role installed.

Registry information

To use the hotfix, you do not have to change the registry.

Restart requirement

You must restart the computer after you apply this hotfix.

Note If you stop the DNS Server service before you install this hotfix, you do not have to restart the computer.

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 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. MUM and MANIFEST files, and the associated security catalog (.cat) files, are extremely important to maintaining the state of the updated component. 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

6.1.7600.20787

695,808

24-Aug-2010

00:54

x64

Dnsserver.events.xml

Not applicable

609

10-Jun-2009

20:31

Not applicable

Workaround

To work around this issue, run the following command to disable the background zone loading feature on the affected DNS server:

dnscmd /Config /DsMinimumBackgroundLoadThreads 0


Note If the background zone loading feature is disabled, the DNS Server service does not respond to name resolution requests until the zones are loaded completely. If you host large zones, the loading process may require several minutes.

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 the background zone loading feature, visit the following Microsoft website:

General information about the background zone loading featureFor 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_62d369fe5ae7295d63dbd2fc152a1f98_31bf3856ad364e35_6.1.7600.20787_none_13f3781a54e55ddf.manifest

File version

Not applicable

File size

710

Date (UTC)

24-Aug-2010

Time (UTC)

18:48

Platform

Not applicable

File name

Amd64_microsoft-windows-dns-server-service_31bf3856ad364e35_6.1.7600.20787_none_aa867a2e0961699f.manifest

File version

Not applicable

File size

158,131

Date (UTC)

24-Aug-2010

Time (UTC)

01:42

Platform

Not applicable

File name

Update.mum

File version

Not applicable

File size

1,671

Date (UTC)

24-Aug-2010

Time (UTC)

18:48

Platform

Not applicable

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