You create a device driver that is based on the Microsoft PassThru Network Driver Interface Specification (NDIS) Intermediate Driver from the Windows Driver Kit (WDK). Then, you install this device driver on a computer that is running Windows Vista. When you restart the computer, Windows Vista incorrectly detects the miniport edge of the PassThru driver as a wireless local area network (WLAN) adapter.

Therefore, if you access the WLAN adapter manually, you may be unable to connect to a wireless access point.

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This problem occurs because the WLAN API incorrectly returns the intermediate driver as an interface that is not in a ready state.

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Service pack information

To resolve this problem, obtain the latest service pack for Windows Vista. For more information, click the following article number to view the article in the Microsoft Knowledge Base:

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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 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

No prerequisites are required to apply this hotfix.

Restart requirement

You must restart the computer after you apply this hotfix.

Hotfix replacement information

This hotfix does not replace any other hotfix.

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 Vista, 32-bit versions

File name	File version	File size	Date	Time	Platform
Report.system.wireless.xml	Not Applicable	59,620	07-Jan-2007	05:38	Not Applicable
Rules.system.wireless.xml	Not Applicable	164,680	07-Jan-2007	05:38	Not Applicable
Wlansvc.dll	6.0.6000.20522	502,784	25-Jan-2007	05:16	x86
Wlanmsm.dll	6.0.6000.20522	290,816	25-Jan-2007	05:16	x86
Wlansec.dll	6.0.6000.20522	297,984	25-Jan-2007	05:16	x86
Wlanhlp.dll	6.0.6000.20522	67,584	25-Jan-2007	05:16	x86
Wlanapi.dll	6.0.6000.20522	47,104	25-Jan-2007	05:16	x86

Windows Vista, 64-bit versions

File name	File version	File size	Date	Time	Platform
Wlansec.dll	6.0.6000.20522	372,224	25-Jan-2007	06:24	x64
Wlanmsm.dll	6.0.6000.20522	350,208	25-Jan-2007	06:24	x64
Wlansvc.dll	6.0.6000.20522	603,648	25-Jan-2007	06:24	x64
Wlanhlp.dll	6.0.6000.20522	97,792	25-Jan-2007	06:24	x64
Wlanapi.dll	6.0.6000.20522	62,976	25-Jan-2007	06:24	x64

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Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section. This problem was first corrected in Windows Vista Service Pack 1.

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

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