Microsoft KB Archive/935664

= A Windows Server 2003-based DHCP server sends DNS update requests even though you have disabled DNS dynamic updates on the DHCP server =

Article ID: 935664

Article Last Modified on 10/11/2007

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APPLIES TO


 * Microsoft Windows Server 2003, Standard Edition (32-bit x86)
 * Microsoft Windows Server 2003, Web Edition
 * Microsoft Windows Server 2003, Enterprise Edition
 * Microsoft Windows Server 2003, Datacenter Edition (32-bit x86)
 * Microsoft Windows Server 2003, Standard x64 Edition
 * Microsoft Windows Server 2003, Enterprise x64 Edition
 * Microsoft Windows Server 2003, Datacenter x64 Edition
 * Microsoft Windows Server 2003, Enterprise Edition for Itanium-based Systems
 * Microsoft Windows Server 2003, Datacenter Edition for Itanium-Based Systems

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SYMPTOMS
On a Microsoft Windows Server 2003-based DHCP server, you have disabled DNS dynamic updates. However, the DHCP server continues to send DNS update requests.

This problem occurs if the following conditions are true:
 * You have defined DHCP reservations in a scope on the DHCP server.
 * You have disabled DNS dynamic updates in the DHCP server properties or in the DHCP scope properties.
 * An IP address that is defined in the DHCP reservations is released.

This problem does not prevent DHCP clients from obtaining TCP/IP configurations from the DHCP server. However, many unnecessary DNS update entries are added to the DHCP server log. Therefore, it may be difficult for administrators to troubleshoot DHCP-related problems by using information in the DHCP server log. Additionally, this problem generates unnecessary network traffic.

Note This problem does not occur if the reservations are not defined.



CAUSE
This problem occurs because the DHCP Server service incorrectly sends DNS update requests when the DHCP Server service releases IP addresses in the DHCP reservations. The DHCP Server service does not check the DNS settings before it sends DNS update requests.



Hotfix information
A supported hotfix is now available from Microsoft. However, it is intended to correct only the problem that is described in this article. Apply it only to systems that are experiencing this specific problem. This hotfix may receive additional testing. Therefore, if you are not severely affected by this problem, we recommend that you wait for the next Windows Server 2003 service pack that contains this hotfix.

To resolve this problem immediately, contact Microsoft Customer Support Services to obtain the hotfix. For a complete list of Microsoft Customer Support Services telephone numbers and information about support costs, visit the following Microsoft Web site:

http://support.microsoft.com/contactus/?ws=support

Note In special cases, charges that are ordinarily incurred for support calls may be canceled if a Microsoft Support Professional determines that a specific update will resolve your problem. The usual support costs will apply to additional support questions and issues that do not qualify for the specific update in question.

Prerequisites
To apply this hotfix, you must have Windows Server 2003 Service Pack 1 (SP1) or Windows Server 2003 Service Pack 2 (SP2) installed on the computer. For more information, 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
After you apply this hotfix, you must restart the DHCP Server service.

Hotfix replacement information
This hotfix does not replace any other hotfixes.

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 with Service Pack 2, x64-based versions


STATUS
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the &quot;Applies to&quot; section.



MORE INFORMATION
The following is an example of the unnecessary DNS update entries that are logged in the DHCP server log: ID,Date,Time,Description,IP Address,Host Name,MAC Address 30,03/13/07,09:45:30,DNS Update Request,155.12.11.10,,, 12,03/13/07,09:45:30,Release,10.11.12.155,,0003FF731FE4, 32,03/13/07,09:45:30,DNS Update Successful,10.11.12.155,,, For more information about DNS dynamic updates in DHCP, click the following article number to view the article in the Microsoft Knowledge Base:

816592 How to configure DNS dynamic updates in Windows Server 2003

For more information about the standard terminology that is used to describe Microsoft software updates, 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 query words: dhcp reservation dns update

Keywords: kbbug kbfix kbqfe kbpubtypekc kbexpertiseinter kbhotfixserver kbwinserv2003postsp2fix KB935664

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