Applications or services that call the WNetOpenEnum function may crash when the number of network providers exceeds 16 on a Windows Server 2008-based computer

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Article ID: 955512 - View products that this article applies to.
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SYMPTOMS

Consider the following scenario:
  • You have more than 16 network providers on a Windows Server 2008-based computer.
  • An application calls the WNetOpenEnum function to enumerate the network resources.
In this scenario, the application may encounter an access violation and then crash.

CAUSE

This problem may occur because the Multiple Provider Router (MPR) module does not manage allocated memory space correctly when the number of network providers exceeds 16.

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.

Important Windows Vista and Windows Server 2008 hotfixes are included in the same packages. However, only one of these products may be listed on the “Hotfix Request” page. To request the hotfix package that applies to both Windows Vista and Windows Server 2008, just select the product that is listed on the page.

Prerequisites

To apply this hotfix, you must have Windows Server 2008 and Windows Vista Service Pack 1 (SP1) installed.

Note Windows Vista SP1 is integrated into Windows Server 2008.

Restart requirement

You must restart the computer 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.

Note The MANIFEST files (.manifest) and the MUM files (.mum) that are installed for each environment are listed separately in the "Additional file information for Windows Server 2008 and for Windows Vista" section. MANIFEST and MUM files and the associated security catalog (.cat) files are very important for maintaining the state of the updated component. The security catalog files, for which the attributes are not listed, are signed with a Microsoft digital signature.
For all supported 32-bit versions of Windows Server 2008 and of Windows Vista
Collapse this tableExpand this table
File nameFile versionFile sizeDateTimePlatform
Mpr.dll6.0.6001.2223068,60827-Jul-200823:00x86
For all supported 64-bit versions of Windows Server 2008 and of Windows Vista
Collapse this tableExpand this table
File nameFile versionFile sizeDateTimePlatform
Mpr.dll6.0.6001.2223085,50427-Jul-200823:29x64
Mpr.dll6.0.6001.2223068,60827-Jul-200823:00x86
For all supported Windows Server 2008 Itanium-Based Systems operating systems
Collapse this tableExpand this table
File nameFile versionFile sizeDateTimePlatform
Mpr.dll6.0.6001.22230190,97627-Jul-200823:13IA-64
Mpr.dll6.0.6001.2223068,60827-Jul-200823:00x86

Additional file information for Windows Server 2008 and of Windows Vista

Additional files for all supported 32-bit versions of Windows Server 2008 and of Windows Vista
Collapse this tableExpand this table
File namePackage_1_for_kb955512~31bf3856ad364e35~x86~~6.0.1.0.mum
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Time (UTC)21:16
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File versionNot Applicable
File size1,938
Date (UTC)28-Jul-2008
Time (UTC)21:16
PlatformNot Applicable
File namePackage_3_for_kb955512~31bf3856ad364e35~x86~~6.0.1.0.mum
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File size1,776
Date (UTC)28-Jul-2008
Time (UTC)21:16
PlatformNot Applicable
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File size1,776
Date (UTC)28-Jul-2008
Time (UTC)21:16
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Date (UTC)28-Jul-2008
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Date (UTC)28-Jul-2008
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Time (UTC)21:16
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Date (UTC)28-Jul-2008
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Date (UTC)28-Jul-2008
Time (UTC)21:16
PlatformNot Applicable
File nameX86_e2b246a0b7cb2fa91e9e9010a1776ee7_31bf3856ad364e35_6.0.6001.22230_none_47ced52fa980d83a.manifest
File versionNot Applicable
File size691
Date (UTC)28-Jul-2008
Time (UTC)21:16
PlatformNot Applicable
File nameX86_microsoft-windows-mpr_31bf3856ad364e35_6.0.6001.22230_none_ae3ef85f71274265.manifest
File versionNot Applicable
File size7,628
Date (UTC)27-Jul-2008
Time (UTC)23:24
PlatformNot Applicable
Additional files for all supported 64-bit versions of Windows Server 2008 and of Windows Vista
Collapse this tableExpand this table
File nameAmd64_17d4095db222d886bb21c9b649c7245d_31bf3856ad364e35_6.0.6001.22230_none_3d6799ed39c01554.manifest
File versionNot Applicable
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Date (UTC)28-Jul-2008
Time (UTC)21:16
PlatformNot Applicable
File nameAmd64_f8906b604d1519b5194f42e06007a895_31bf3856ad364e35_6.0.6001.22230_none_591b970442d537b2.manifest
File versionNot Applicable
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Date (UTC)28-Jul-2008
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Date (UTC)28-Jul-2008
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File namePackage_for_kb955512_server~31bf3856ad364e35~amd64~~6.0.1.0.mum
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File namePackage_for_kb955512_winpesrv~31bf3856ad364e35~amd64~~6.0.1.0.mum
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Date (UTC)27-Jul-2008
Time (UTC)23:24
PlatformNot Applicable
Additional files for all supported Windows Server 2008 Itanium-Based Systems operating systems
Collapse this tableExpand this table
File nameIa64_06bb89c9e19131996ebb21f986a5690a_31bf3856ad364e35_6.0.6001.22230_none_799eb5e44b96dd4b.manifest
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Date (UTC)28-Jul-2008
Time (UTC)21:16
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Date (UTC)28-Jul-2008
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File namePackage_1_for_kb955512~31bf3856ad364e35~ia64~~6.0.1.0.mum
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Date (UTC)28-Jul-2008
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File namePackage_for_kb955512_winpesrv~31bf3856ad364e35~ia64~~6.0.1.0.mum
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File nameX86_microsoft-windows-mpr_31bf3856ad364e35_6.0.6001.22230_none_ae3ef85f71274265.manifest
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File size7,628
Date (UTC)27-Jul-2008
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WORKAROUND

To work around this problem, uninstall any network providers that you do not regularly use.

STATUS

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

MORE INFORMATION

A network provider is a .dll file that enables Windows to interact with other kinds of networks, such as with Novell networks. A network provider is a client of the Windows WNet driver. A network provider implements network-specific actions, such as creating a connection. Additionally, it exposes a common interface to Windows. This interface is called the Network Provider API, and it consists of functions that are implemented by the network provider. You can create a network provider DLL to support new network protocols.

Because each network exposes a common interface through its provider, Windows can interact with several kinds of networks without knowing their network-specific implementation details.

The Multiple Provider Router (MPR) handles communication with all the network providers on the system, and it presents an integrated network to the user.

The third-party products that this article discusses are manufactured by companies that are independent of Microsoft. Microsoft makes no warranty, implied or otherwise, about the performance or reliability of these products.

For more information about software update terminology, 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

Properties

Article ID: 955512 - Last Review: October 8, 2011 - Revision: 2.0
APPLIES TO
  • Windows Server 2008 Standard
  • Windows Server 2008 Enterprise
  • Windows Server 2008 Datacenter
  • Windows Server 2008 Datacenter without Hyper-V
  • Windows Server 2008 Enterprise without Hyper-V
  • Windows Server 2008 for Itanium-Based Systems
  • Windows Server 2008 Standard without Hyper-V
  • Windows Vista Service Pack 1, when used with:
    • Windows Vista Ultimate 64-bit Edition
    • Windows Vista Enterprise 64-bit Edition
    • Windows Vista Business 64-bit Edition
    • Windows Vista Home Premium 64-bit Edition
Keywords: 
kbautohotfix kbexpertiseinter kbbug kbfix kbqfe KB955512

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