Microsoft KB Archive/939928

= A memory leak occurs if the DNS dynamic update protocol is enabled on a DHCP server that is running Windows Server 2003 =

Article ID: 939928

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, Enterprise Edition
 * Microsoft Windows Server 2003, Datacenter Edition (32-bit x86)
 * Microsoft Windows Server 2003, Web Edition
 * 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
A memory leak occurs on a DHCP server that is running Microsoft Windows Server 2003. When this problem occurs, you may experience one or more of the following symptoms:
 * System Monitor indicates that the Private Bytes value of the Tcpsvcs.exe process continues to increase. (The performance log may also include this information.)
 * The DHCP Server service does not work.
 * The system runs slowly.

This problem does not occur if the DNS dynamic update protocol is disabled on the DHCP server. By default, this feature is enabled.



CAUSE
This problem occurs because the Dnsapi.dll module incorrectly manages some memory resources.



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 or Windows Server 2003 Service Pack 2 installed. 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 1, Itanium-based versions


WORKAROUND
To work around this problem, disable the dynamic update feature on the DHCP server. To do this, follow these steps:  Click Start, click Run, type dhcpmgmt.msc, and then click OK. In the console tree, right-click the node that corresponds to the DHCP server, and then click Properties. On the DNS tab, click to clear the Enable DNS dynamic updates according to the settings below check box, and then click OK. Restart the DHCP Server service. For example, type the following command at a command prompt, and then press ENTER:

Net stop DHCPServer && Net Start DHCPServer





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 about software update terminology, click the following article number to view the article in the Microsoft Knowledge Base:

824684Description of the standard terminology that is used to describe Microsoft software updates

Additional query words: DNSAPI memory leak from DHCP server in TCPSVCS

Keywords: kbbug kbfix kbqfe kbpubtypekc kbexpertiseinter kbhotfixserver kbwinserv2003postsp2fix KB939928

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