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Article ID: 2755105 - Last Review: October 10, 2012 - Revision: 1.0

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Symptoms

Assume that a wireless network adapter is installed on a computer that is running Windows 7 Service Pack 1 (SP1) or Windows Server 2008 R2 SP1. Additionally, assume that you perform one of the following actions:
  • Enable or disable the Wi-Fi switch.
  • Resume the computer from sleep mode or hibernate mode.
  • Restart the computer.
In this situation, the WLAN AutoConfig service cannot identify which networks are available and connects to a network randomly.

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 the problem described in this article. 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 website:
http://support.microsoft.com/contactus/?ws=support (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 be running one of the following operating systems:
  • Windows 7
  • Windows 7 Service Pack 1 (SP1)
  • Windows Server 2008 R2
  • Windows Server 2008 R2 Service Pack 1 (SP1)
For more information about how to obtain a Windows 7 or Windows Server 2008 R2 service pack, click the following article number to view the article in the Microsoft Knowledge Base:
976932  (http://support.microsoft.com/kb/976932/ ) Information about Service Pack 1 for Windows 7 and for Windows Server 2008 R2

Registry information

To apply this hotfix, you do not have to make any changes to the registry.

Restart requirement

You must restart the computer after you apply this hotfix.

Hotfix replacement information

This hotfix does not replace a previously released hotfix.

File information

The global version of this hotfix installs files that have the attributes that are listed in the following tables. The dates and the times for these files are listed in Coordinated Universal Time (UTC). The dates and the times for these files on your local computer are displayed in your local time together with your current daylight saving time (DST) bias. Additionally, the dates and the times may change when you perform certain operations on the files.
Windows 7 and Windows Server 2008 R2 file information notes
Important Windows 7 hotfixes and Windows Server 2008 R2 hotfixes are included in the same packages. However, hotfixes on the Hotfix Request page are listed under both operating systems. To request the hotfix package that applies to one or both operating systems, select the hotfix that is listed under "Windows 7/Windows Server 2008 R2" on the page. Always refer to the "Applies To" section in articles to determine the actual operating system that each hotfix applies to.
  • The files that apply to a specific product, milestone (RTM, SPn), and service branch (LDR, GDR) can be identified by examining the file version numbers as shown in the following table:
    Collapse this tableExpand this table
    VersionProductMilestoneService branch
    6.1.760 0.16xxxWindows 7 and Windows Server 2008 R2RTMGDR
    6.1.760 1.17xxxWindows 7 and Windows Server 2008 R2SP1GDR
    6.1.760 1.22xxxWindows 7 and Windows Server 2008 R2SP1LDR
  • GDR service branches contain only those fixes that are widely released to address widespread, critical issues. LDR service branches contain hotfixes in addition to widely released fixes.
  • 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 7 and for Windows Server 2008 R2" section. MUM and MANIFEST files, and the associated security catalog (.cat) files, are critical to 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 x86-based versions of Windows 7
Collapse this tableExpand this table
File nameFile versionFile sizeDateTime
Report.system.wireless.xmlNot applicable59,62010-Jun-200921:41
Rules.system.wireless.xmlNot applicable159,92410-Jun-200921:41
Wlan.mofNot applicable12,88010-Jun-200921:41
Wlanapi.dll6.1.7600.1638581,40814-Jul-200901:16
Wlanhlp.dll6.1.7600.1638584,48014-Jul-200901:16
Wlanmsm.dll6.1.7601.17950428,03206-Sep-201216:35
Wlansec.dll6.1.7600.16385392,19214-Jul-200901:16
Wlansvc.dll6.1.7600.16385829,44014-Jul-200901:16
Wlansvc.ptxmlNot applicable26,62313-Jul-200920:50
Report.system.wireless.xmlNot applicable59,62010-Jun-200921:41
Rules.system.wireless.xmlNot applicable159,92410-Jun-200921:41
Wlan.mofNot applicable12,88010-Jun-200921:41
Wlanapi.dll6.1.7600.1638581,40814-Jul-200901:16
Wlanhlp.dll6.1.7600.1638584,48014-Jul-200901:16
Wlanmsm.dll6.1.7601.22108428,03206-Sep-201216:31
Wlansec.dll6.1.7600.16385392,19214-Jul-200901:16
Wlansvc.dll6.1.7601.22108829,44006-Sep-201216:31
Wlansvc.ptxmlNot applicable26,62313-Jul-200920:50
For all supported x64-based versions of Windows 7 and of Windows Server 2008 R2
Collapse this tableExpand this table
File nameFile versionFile sizeDateTimePlatform
Report.system.wireless.xmlNot applicable59,62010-Jun-200921:03Not applicable
Rules.system.wireless.xmlNot applicable159,92410-Jun-200921:03Not applicable
Wlan.mofNot applicable12,88010-Jun-200921:03Not applicable
Wlanapi.dll6.1.7600.16385114,17614-Jul-200901:41x64
Wlanhlp.dll6.1.7600.16385119,29614-Jul-200901:41x64
Wlanmsm.dll6.1.7601.17950414,20806-Sep-201217:42x64
Wlansec.dll6.1.7600.16385448,00014-Jul-200901:41x64
Wlansvc.dll6.1.7600.16385886,78414-Jul-200901:41x64
Wlansvc.ptxmlNot applicable26,62313-Jul-200920:40Not applicable
Report.system.wireless.xmlNot applicable59,62010-Jun-200921:03Not applicable
Rules.system.wireless.xmlNot applicable159,92410-Jun-200921:03Not applicable
Wlan.mofNot applicable12,88010-Jun-200921:03Not applicable
Wlanapi.dll6.1.7600.16385114,17614-Jul-200901:41x64
Wlanhlp.dll6.1.7600.16385119,29614-Jul-200901:41x64
Wlanmsm.dll6.1.7601.22108414,72006-Sep-201218:04x64
Wlansec.dll6.1.7600.16385448,00014-Jul-200901:41x64
Wlansvc.dll6.1.7600.16385886,78414-Jul-200901:41x64
Wlansvc.ptxmlNot applicable26,62313-Jul-200920:40Not applicable
Wlan.mofNot applicable12,88010-Jun-200921:41Not applicable
Wlanapi.dll6.1.7600.1638581,40814-Jul-200901:16x86
Wlanhlp.dll6.1.7600.1638584,48014-Jul-200901:16x86
Wlanmsm.dll6.1.7601.17950428,03206-Sep-201216:35x86
Wlansec.dll6.1.7600.16385392,19214-Jul-200901:16x86
Wow64_wlansvc.ptxmlNot applicable26,62313-Jul-200920:50Not applicable
Wlan.mofNot applicable12,88010-Jun-200921:41Not applicable
Wlanapi.dll6.1.7600.1638581,40814-Jul-200901:16x86
Wlanhlp.dll6.1.7600.1638584,48014-Jul-200901:16x86
Wlanmsm.dll6.1.7601.22108428,03206-Sep-201216:31x86
Wlansec.dll6.1.7600.16385392,19214-Jul-200901:16x86
Wow64_wlansvc.ptxmlNot applicable26,62313-Jul-200920:50Not applicable

Status

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

More information

For more information about software update terminology, click the following article number to view the article in the Microsoft Knowledge Base:
824684  (http://support.microsoft.com/kb/824684/ ) Description of the standard terminology that is used to describe Microsoft software updates

Additional file information

Additional file information for Windows 7 and for Windows Server 2008 R2

Additional files for all supported x86-based versions of Windows 7
Collapse this tableExpand this table
File nameX86_97d0027b7d4d083180b2ae7938453534_31bf3856ad364e35_6.1.7601.22108_none_215ffe845acd5fc8.manifest
File versionNot applicable
File size695
Date (UTC)07-Sep-2012
Time (UTC)14:40
File nameX86_b0e08335ef69aa4da4e1d3a85ed820c5_31bf3856ad364e35_6.1.7601.17950_none_528cf8320f449a25.manifest
File versionNot applicable
File size695
Date (UTC)07-Sep-2012
Time (UTC)14:40
File nameX86_microsoft-windows-wlansvc_31bf3856ad364e35_6.1.7601.17950_none_9e1c72fe634c3947.manifest
File versionNot applicable
File size214,358
Date (UTC)07-Sep-2012
Time (UTC)14:43
File nameX86_microsoft-windows-wlansvc_31bf3856ad364e35_6.1.7601.22108_none_9ee3f9d77c3a4b56.manifest
File versionNot applicable
File size214,358
Date (UTC)07-Sep-2012
Time (UTC)14:43
Additional files for all supported x64-based versions of Windows 7 and of Windows Server 2008 R2
Collapse this tableExpand this table
File nameAmd64_897626b71bf4b1f427aa242deea8b46f_31bf3856ad364e35_6.1.7601.17950_none_68498aa62de7d2e9.manifest
File versionNot applicable
File size1,040
Date (UTC)07-Sep-2012
Time (UTC)14:40
File nameAmd64_9d274b05ba0f485d09319f4d25225357_31bf3856ad364e35_6.1.7601.22108_none_4edd210f3d2b7553.manifest
File versionNot applicable
File size1,040
Date (UTC)07-Sep-2012
Time (UTC)14:40
File nameAmd64_microsoft-windows-wlansvc_31bf3856ad364e35_6.1.7601.17950_none_fa3b0e821ba9aa7d.manifest
File versionNot applicable
File size214,362
Date (UTC)07-Sep-2012
Time (UTC)14:40
File nameAmd64_microsoft-windows-wlansvc_31bf3856ad364e35_6.1.7601.22108_none_fb02955b3497bc8c.manifest
File versionNot applicable
File size214,362
Date (UTC)07-Sep-2012
Time (UTC)14:40
File nameWow64_microsoft-windows-wlansvc_31bf3856ad364e35_6.1.7601.17950_none_048fb8d4500a6c78.manifest
File versionNot applicable
File size210,956
Date (UTC)07-Sep-2012
Time (UTC)14:40
File nameWow64_microsoft-windows-wlansvc_31bf3856ad364e35_6.1.7601.22108_none_05573fad68f87e87.manifest
File versionNot applicable
File size210,956
Date (UTC)07-Sep-2012
Time (UTC)14:40

Applies to
  • Windows Server 2008 R2 Service Pack 1
  • Windows Server 2008 R2 Foundation
  • Windows Server 2008 R2 for Itanium-Based Systems
  • Windows Server 2008 R2 Standard
  • Windows Server 2008 R2 Enterprise
  • Windows Server 2008 R2 Datacenter
  • Windows Web Server 2008 R2
  • Windows 7 Enterprise
  • Windows 7 Home Basic
  • Windows 7 Home Premium
  • Windows 7 Professional
  • Windows 7 Starter
  • Windows 7 Ultimate
  • Windows 7 Service Pack 1
Keywords: 
kbautohotfix kbqfe kbhotfixserver kbfix kbexpertiseadvanced kbsurveynew KB2755105
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