Incomplete CNAME resource recordset is returned if a DNS recursive lookup fails in Windows 8 or Windows Server 2012

Symptoms

Consider the following scenario:

  • You have a computer that's running Windows 8 or Windows Server 2012.

  • You try to perform a Domain Name System (DNS) query from the computer.

  • You find that an incomplete alias (CNAME) resource recordset is returned if the DNS recursive lookup fails. For example, the recordset may be missing the A/AAAA record.

In this scenario, you cannot obtain the correct alias recordset in future queries of that DNS resource record for a particular time period. Additionally after the time period has expired, you find you still cannot perform a correct CNAME resource recordset query. This behavior occurs because the CNAME Time to Live (TTL) setting is returned from the previous failed recursive lookup.

Cause

This problem occurs because of an issue in the way that the DNS client caches the CNAME resource recordset.

Resolution

Hotfix information

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:

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 have Windows 8 or Windows Server 2012 installed.

Restart requirement

You must restart the computer after you apply this hotfix.

Hotfix replacement information

This hotfix does not replace any previously released hotfix.

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 notesImportant 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.

    Version

    Product

    Milestone

    Service branch

    6.2.920 0.20 xxx

    Windows 8 and Windows Server 2012

    RTM

    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 8 and 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 x86-based versions of Windows 8

File name

File version

File size

Date

Time

Platform

Dnsapi.dll

6.2.9200.20900

461,824

20-Dec-2013

06:32

x86

Dnsrslvr.dll

6.2.9200.20900

160,768

20-Dec-2013

06:32

x86

For all supported x64-based versions of Windows 8 and of Windows Server 2012

File name

File version

File size

Date

Time

Platform

Dnsapi.dll

6.2.9200.20897

605,184

20-Dec-2013

00:38

x64

Dnsrslvr.dll

6.2.9200.20900

210,944

20-Dec-2013

00:38

x64

Dnsapi.dll

6.2.9200.20900

461,824

20-Dec-2013

06:32

x86


Status

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

Additional file information for Windows 8 and for Windows Server 2012

Additional files for all supported x86-based versions of Windows 8

File name

X86_8fce0eb305185431e8b0dfe8b7aa400b_31bf3856ad364e35_6.2.9200.20900_none_02bcab1569ee4521.manifest

File version

Not Applicable

File size

705

Date (UTC)

20-Dec-2013

Time (UTC)

16:11

Platform

Not Applicable

File name

X86_microsoft-windows-dns-client-minwin_31bf3856ad364e35_6.2.9200.20900_none_9312e4220d6cab50.manifest

File version

Not Applicable

File size

22,278

Date (UTC)

20-Dec-2013

Time (UTC)

07:05

Platform

Not Applicable

Additional files for all supported x64-based versions of Windows 8 and of Windows Server 2012

File name

Amd64_5c137beb2ea7c29c98bfde85471312e0_31bf3856ad364e35_6.2.9200.20900_none_0131eafb8a914b4d.manifest

File version

Not Applicable

File size

709

Date (UTC)

20-Dec-2013

Time (UTC)

16:12

Platform

Not Applicable

File name

Amd64_5c67d03c295ec0d6969f4600b4133628_31bf3856ad364e35_6.2.9200.20900_none_f10dc3fd11b05e7d.manifest

File version

Not Applicable

File size

709

Date (UTC)

20-Dec-2013

Time (UTC)

16:12

Platform

Not Applicable

File name

Amd64_microsoft-windows-dns-client-minwin_31bf3856ad364e35_6.2.9200.20900_none_ef317fa5c5ca1c86.manifest

File version

Not Applicable

File size

22,286

Date (UTC)

20-Dec-2013

Time (UTC)

10:03

Platform

Not Applicable

File name

Wow64_microsoft-windows-dns-client-minwin_31bf3856ad364e35_6.2.9200.20900_none_f98629f7fa2ade81.manifest

File version

Not Applicable

File size

18,396

Date (UTC)

20-Dec-2013

Time (UTC)

07:05

Platform

Not Applicable


References

Learn about the terminology Microsoft uses to describe software updates.

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