Consider the following scenario:

•	You have a program that allocates a large block of contiguous memory in Windows Server 2003 with Service Pack 2 (SP2). For example, this program allocates a 1.5-gigabyte (GB) block of memory when the program starts or after it starts.
•	This program loads the Hnetcfg.dll library.

In this scenario, the program may not start. Or, after the program starts, it may intermittently fail. If you troubleshoot these program failures, you may find that the program could not successfully allocate the large block of contiguous memory.

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This problem occurs because the Hnetcfg.dll library has an image base address of 5F270000. If the Hnetcfg.dll library is loaded at this address, memory fragmentation of the Windows user address space may occur. You experience this fragmentation because the Hnetcfg.dll library is loaded at approximately 1.6 GB into the address space.

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Hotfix information

A supported hotfix is now 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 Windows Server 2003 service pack that contains this hotfix.

To resolve this problem, submit a request to Microsoft Online Customer Services to obtain the hotfix. To submit an online request to obtain the hotfix, visit the following Microsoft Web site:Note If additional issues occur or 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. To create a separate service request, visit the following Microsoft Web site:

Prerequisites

To apply this hotfix, you must have Windows Server 2003 SP2 installed on the computer.

Restart requirement

You must restart the computer after you apply this hotfix.

Hotfix replacement information

This hotfix replaces hotfix 913409.

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 (SP2), x86-based versions

File name	File version	File size	Date	Time	Platform
Hnetcfg.dll	5.2.3790.4243	355,328	28-Feb-2008	11:53	x86

Windows Server 2003 with SP2, Itanium-based versions

File name	File version	File size	Date	Time	Platform	SP requirement	Service branch
Hnetcfg.dll	5.2.3790.4243	1,104,384	28-Feb-2008	09:44	IA-64	SP2	Not Applicable
Whnetcfg.dll	5.2.3790.4243	355,328	28-Feb-2008	09:44	x86	SP2	WOW

Windows Server 2003, x64-based versions

File name	File version	File size	Date	Time	Platform	SP requirement	Service branch
Hnetcfg.dll	5.2.3790.4243	581,632	28-Feb-2008	09:47	x64	SP2	Not Applicable
Whnetcfg.dll	5.2.3790.4243	355,328	28-Feb-2008	09:47	x86	SP2	WOW

Windows XP with SP2, x64-based versions

File name	File version	File size	Date	Time	Platform	SP requirement	Service branch
Hnetcfg.dll	5.2.3790.4243	581,632	28-Feb-2008	09:47	x64	SP2	Not Applicable
Whnetcfg.dll	5.2.3790.4243	355,328	28-Feb-2008	09:47	x86	SP2	WOW

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Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.

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The same problem occurs in the release version of Windows Server 2003. For more information, click the following article number to view the article in the Microsoft Knowledge Base:

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Technical support for x64-based versions of Microsoft Windows

If your hardware came with a Microsoft Windows x64 edition already installed, your hardware manufacturer provides technical support and assistance for the Windows x64 edition. In this case, your hardware manufacturer provides support because a Windows x64 edition was included with your hardware. Your hardware manufacturer might have customized the Windows x64 edition installation by using unique components. Unique components might include specific device drivers or might include optional settings to maximize the performance of the hardware. Microsoft will provide reasonable-effort assistance if you must have technical help with a Windows x64 edition. However, you might have to contact your manufacturer directly. Your manufacturer is best qualified to support the software that your manufacturer installed on the hardware. If you purchased a Windows x64 edition such as a Windows Server 2003 x64 edition separately, contact Microsoft for technical support.

For product information about Windows XP Professional x64 Edition, visit the following Microsoft Web site: For product information about x64-based versions of Windows Server 2003, visit the following Microsoft Web site:

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

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