Microsoft KB Archive/936009

= The &quot;Lease duration for DHCP clients&quot; option is set to 0 and some DHCP scope options disappear on a Windows Server 2003-based DHCP server =

Article ID: 936009

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
Consider the following scenario. You have a Microsoft Windows Server 2003-based Dynamic Host Configuration Protocol (DHCP) server. You use this server to assign TCP/IP configurations to client computers. Then, you restart the DHCP Server service. In this scenario, you experience the following symptoms:
 * The Lease duration for DHCP clients option for the DHCP scope is set to 0.
 * Some DHCP scope options disappear.

This problem occurs if the following conditions are true:
 * You have defined DHCP reservations in the scope.
 * You have not specified the complete IP address in the IP address field of the DHCP reservations.

When this problem occurs, client computers do not have the correct TCP/IP configurations. Therefore, the client computers cannot communicate with other computers over the network.



CAUSE
This problem occurs because the DHCP Server service does not validate the IP address that is in the IP address field of the DHCP reservation. The DHCP Server service allows for a reservation to be created even if the IP address is invalid. If you continue to add the reservation without specifying all the values in the reservation, the IP address in the reservation is listed as the scope identifier.

When the DHCP Server service starts, the DHCP server cannot correctly assign the corresponding options into the scope options because the scope and the reservation have the same identifier. In this situation, some scope options are moved from the scope to the reservation. Additionally, the lease time of the scope is reset to zero.



RESOLUTION
After you apply this hotfix, the DHCP Server service validates the IP address in the IP address field of the DHCP reservations before the reservation is created. This validation makes sure that the last octet of the IP address meets the following conditions:
 * The last octet is not empty.
 * The last octet ranges from 0 to 255, excluding 0 and 255.

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 2 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
You must restart the DHCP Server service after you apply this hotfix.

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
For more information, 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: scope dhcp reservation invalid

Keywords: kbbug kbfix kbqfe kbpubtypekc kbexpertiseinter kbhotfixserver kbwinserv2003postsp2fix KB936009

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