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

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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.

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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.

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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 this specific problem. 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=support

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.

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.