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802.1X authentication fails after you connect a computer to a network in Windows 7 SP1 or Windows Server 2008 R2 SP1Article ID: 2736878 - View products that this article applies to. On This PageSymptomsAssume that you connect a computer that is running Windows 7 Service Pack 1 (SP1) or Windows Server 2008 R2 SP1 to a network that uses IEEE 802.1X authentication. Additionally, assume that you set up the connection by using a device that supports the 802.1X authentication protocol (for example, an 802.1X-capable switch). When you start the computer, 802.1X authentication fails intermittently. Note To check whether the authentication fails, run the netsh lan show interface command. CauseThis issue occurs because a Read process starts before the network adapter is initialized. ResolutionHotfix informationA 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 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.
(http://support.microsoft.com/contactus/?ws=support)
PrerequisitesTo apply this hotfix, you must be running Windows 7 Service Pack 1 (SP1) or 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 informationTo apply this hotfix, you do not have to make any changes to the registry.Restart requirementYou must restart the computer after you apply this hotfix.Hotfix replacement informationThis hotfix does not replace a previously released hotfix.File informationThe 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 notesImportant 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.
For all supported x86-based versions of Windows 7Collapse this table
For all supported x64-based versions of Windows 7 and of Windows Server 2008 R2Collapse this table
WorkaroundTo work around this issue, restart the Wired AutoConfig service. Note The service name of the Wired AutoConfig service is dot3svc. StatusMicrosoft 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 For more information about wired networking with 802.1X authentication, go to the following Microsoft website:
(http://support.microsoft.com/kb/824684/
)
Description of the standard terminology that is used to describe Microsoft software updates
General information about wired networking with 802.1X authentication For more information about 802.1X authenticated wired access, go to the following Microsoft website:
(http://technet.microsoft.com/en-us/network/bb545365)
General information about 802.1X authenticated wired access For more information about 802.1X authenticated wired access deployment, go to the following Microsoft website:
(http://technet.microsoft.com/library/hh831831)
General information about 802.1X authenticated wired access deployment
(http://technet.microsoft.com/en-us/library/dd348468(v=WS.10).aspx)
Additional file informationAdditional file information for Windows 7 and for Windows Server 2008 R2Additional files for all supported x86-based versions of Windows 7Collapse this table
Additional files for all supported x64-based versions of Windows 7 and of Windows Server 2008 R2Collapse this table
PropertiesArticle ID: 2736878 - Last Review: September 12, 2012 - Revision: 1.0 Applies to
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