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The memory usage of the Dns.exe process keeps increasing after you install hotfix 941672 on a computer that is running Windows Server 2003 SP2 and that has the DNS server role installed

Support for Windows Server 2003 ended on July 14, 2015

Microsoft ended support for Windows Server 2003 on July 14, 2015. This change has affected your software updates and security options. Learn what this means for you and how to stay protected.

Consider the following scenario:
  • You install the DNS server role on a computer that is running Windows Server 2003 Service Pack 2 (SP2).
  • You install hotfix 941672.
In this scenario, the memory usage of the DNS server service (Dns.exe) keeps increasing.
This problem occurs because the DNS server service does not manage allocated memory space correctly in the following situation:
  • A DNS server that is running Windows Server 2003 does not receive responses for a DNS name resolution query from the forwarders or from the root hints.
  • Multiple clients send queries for the same name resolution.
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: 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, the computer must be running Windows Server 2003 Service Pack 2 (SP2) and must have the DNS server role installed.

For more information about how to install the latest service pack for Windows Server 2003, click the following article number to view the article in the Microsoft Knowledge Base:
889100 How to obtain the latest service pack for Windows Server 2003

Restart requirement

You must restart the computer after you apply this hotfix.

Hotfix replacement information

This hotfix does not replace any other hotfix.

File information

The English version of this hotfix has the file attributes (or later file attributes) that are listed in the following table. The dates and times for these files are listed in Coordinated Universal Time (UTC). When you view the file information, it is converted to local time. To find the difference between UTC and local time, use the Time Zone tab in the Date and Time item in Control Panel.
Windows Server 2003 file information note

For all supported x86-based versions of Windows Server 2003

File nameFile versionFile sizeDateTimePlatformSP requirement
Dnsperf.hNot Applicable6,64226-Apr-200804:54Not ApplicableSP2
Dnsperf.iniNot Applicable11,59726-Apr-200804:54Not ApplicableSP2
Tcpip6.sys5.2.3790.4573247,48815-Aug-200907:31Not ApplicableSP2

For all supported x64-based versions of Windows Server 2003
File nameFile versionFile sizeDateTimePlatformSP requirementService branch
Dnsperf.hNot Applicable6,64222-Sep-200903:48Not ApplicableSP2SP2QFE
Dnsperf.iniNot Applicable11,59722-Sep-200903:48Not ApplicableSP2SP2QFE

For all supported Itanium-based versions of Windows Server 2003
File nameFile versionFile sizeDateTimePlatformSP requirement
Dnsperf.hNot Applicable6,64222-Sep-200903:48Not ApplicableSP2
Dnsperf.iniNot Applicable11,59722-Sep-200903:48Not ApplicableSP2
Tcpip6.sys5.2.3790.4573798,84822-Sep-200903:49Not ApplicableSP2
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.
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
For more information, click the following article number to view the article in the Microsoft Knowledge Base:
941672 MS07-062: Vulnerability in DNS could allow spoofing

Article ID: 975830 - Last Review: 10/27/2009 02:58:42 - Revision: 1.0

Microsoft Windows Server 2003 Service Pack 2

  • kbhotfixserver kbsurveynew kbautohotfix kbfix kbbug kbqfe kbexpertiseinter KB975830
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