You are prompted to select a certificate when you connect to a wireless network in Windows 7 or in Windows Server 2008 R2

Applies to: Windows 7Windows Server 2008 R2Windows Server 2008 R2 Service Pack 1 More

Symptoms


Consider the following scenario:
  • You use user certificate authentication for wireless or wired 802.1x connections on a Windows 7-based or Windows Server 2008 R2-based computer. 
  • A user certificate that does not contain a user principal name (UPN) value in the Subject Alt Name (SAN) field (for example, a Lync 2010 self-signed certificate) is installed on the computer.
  • You try to connect to the network.
In this scenario, a dialog box appears and prompts you to select a certificate from the certificate store. Additionally, the authentication process is not successful if you do not select the correct certificate.

Cause


This issue occurs because the Simple Certificate Selection (SCS) components cannot simplify the certificates. Therefore, the SCS components cannot select which certificate to use for Extensible Authentication Protocol (EAP) wireless authentication.

Resolution


To resolve this issue, install the following update. After you install this update, the SCS algorithm ignores certificates that do not contain a UPN value in the SAN field when the algorithm simplifies multiple user certificates. Therefore, the algorithm will ignore Lync 2010 certificates when you try to connect to a wireless network. 

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: 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 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:
    VersionProductMilestoneService branch
    6.1.760
    0.21xxx
    Windows 7 and Windows Server 2008 R2RTMLDR
    6.1.760
    1.21xxx
    Windows 7 and Windows Server 2008 R2SP1LDR
  • 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
File nameFile versionFile sizeDateTime
Rastls.dll6.1.7600.21209372,73608-May-201204:37
Rastls.dll6.1.7601.21989372,73608-May-201204:24
For all supported x64-based versions of Windows 7 and of Windows Server 2008 R2
File nameFile versionFile sizeDateTime
Rastls.dll6.1.7600.21209424,96008-May-201205:30
Rastls.dll6.1.7601.21989424,96008-May-201205:19

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

The SCS component tries to simplify all user certificates to a single group based on the UPN value of the SAN field in each certificate. For more information about the deployment, technology, and components of wireless LANs, go to the following Microsoft website:

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
File nameX86_3ea3dcfd4cde1300e99af71626de6714_31bf3856ad364e35_6.1.7600.21209_none_dd0aa279693ec8d9.manifest
File versionNot applicable
File size694
Date (UTC)09-May-2012
Time (UTC)12:21
File nameX86_52c4586860dcacf77d30e076ca76ec86_31bf3856ad364e35_6.1.7601.21989_none_b2629d7214100117.manifest
File versionNot applicable
File size694
Date (UTC)09-May-2012
Time (UTC)12:21
File nameX86_microsoft-windows-rastls_31bf3856ad364e35_6.1.7600.21209_none_6d1f84d0ca50baaf.manifest
File versionNot applicable
File size4,741
Date (UTC)08-May-2012
Time (UTC)05:45
File nameX86_microsoft-windows-rastls_31bf3856ad364e35_6.1.7601.21989_none_6eaf8a54c7b7d2e1.manifest
File versionNot applicable
File size4,741
Date (UTC)08-May-2012
Time (UTC)05:28
Additional files for all supported x64-based versions of Windows 7 and of Windows Server 2008 R2
File nameAmd64_445e7d22a5f3c9c2cde12bf460b50a01_31bf3856ad364e35_6.1.7600.21209_none_dd21470cf718c062.manifest
File versionNot applicable
File size698
Date (UTC)09-May-2012
Time (UTC)12:21
File nameAmd64_48259e0da8b5e084e35e60bea0b9c06f_31bf3856ad364e35_6.1.7600.21209_none_cf5566f4a0c04eb7.manifest
File versionNot applicable
File size1,036
Date (UTC)09-May-2012
Time (UTC)12:21
File nameAmd64_f10d52c7e72642e2c7f5830a735febfb_31bf3856ad364e35_6.1.7601.21989_none_5c0ccc10488b5db1.manifest
File versionNot applicable
File size698
Date (UTC)09-May-2012
Time (UTC)12:21
File nameAmd64_f20130464a71089d727ffa15a3d542a0_31bf3856ad364e35_6.1.7601.21989_none_5059f51a2363a7e2.manifest
File versionNot applicable
File size1,036
Date (UTC)09-May-2012
Time (UTC)12:21
File nameAmd64_microsoft-windows-rastls_31bf3856ad364e35_6.1.7600.21209_none_c93e205482ae2be5.manifest
File versionNot applicable
File size4,745
Date (UTC)08-May-2012
Time (UTC)06:42
File nameAmd64_microsoft-windows-rastls_31bf3856ad364e35_6.1.7601.21989_none_cace25d880154417.manifest
File versionNot applicable
File size4,745
Date (UTC)08-May-2012
Time (UTC)06:52