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FIX: Error message when you try to debug an ASP.NET 2.0 application in Visual Studio 2005 on a Windows Vista-based computer: "Unable to start debugging on the web server. Debugging failed because integrated Windows authentication is not enab...

Article ID: 937523 - View products that this article applies to.

SYMPTOMS

In Windows Vista Home Basic or in Windows Vista Home Premium, you create a Microsoft ASP.NET 2.0 application by using Internet Information Services (IIS) 7.0. When you try to debug the application in Microsoft Visual Studio 2005, you receive the following error message:

Unable to start debugging on the web server. Debugging failed because integrated Windows authentication is not enabled. Please see Help for assistance.

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CAUSE

This problem occurs because Windows Vista Home Basic and Windows Vista Home Premium do not contain the Windows Authentication module for IIS. When the client tries to automatically attach the debugger in an ASP.NET 2.0 application, the client sends a HTTP request that contains the DEBUG verb. This HTTP request is used to verify that the process of the application is running and to select the correct process to attach. This HTTP request must be authenticated by using Windows Authentication. However, Windows Vista Home Basic and Windows Vista Home Premium do not contain the Windows Authentication module for IIS. Therefore, the problem that is described in the 'Symptoms" section occurs.

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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.

To download this hotfix from the MSDN Code Gallery, visit the following Microsoft Web site:

http://code.msdn.microsoft.com/KB937523

(http://code.msdn.microsoft.com/KB937523)

Note The MSDN Code Gallery displays the languages for which the hotfix is available. If you do not see your language listed, it is because the Code Gallery resource page is not available for that language.

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

(http://support.microsoft.com/contactus/?ws=support)

Prerequisites

You must have Visual Studio 2005 Service Pack 1 (SP1) installed to apply this hotfix.

Restart requirement

You do not have to 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.

Collapse this tableExpand this table

File name	File version	File size	Date	Time	Platform
Microsoft.visualstudio.debugger.dll	8.0.50727.888	45,056	29-May-2007	22:35	x86
Vsdebug.dll	8.0.50727.888	1,320,448	30-May-2007	00:39	x86
Vsdebugui.dll	8.0.50727.888	335,872	29-May-2007	19:40	x86

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STATUS

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

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MORE INFORMATION

This hotfix changes the behavior when the client tries to automatically attach the debugger. The Microsoft.Web.Administration.dll file is used to determine which process to attach to if the following conditions are true:

The HTTP request that contains the DEBUG verb cannot be sent because of an authentication failure.
The application is debugged locally. For example, the Web server and the client are on the same computer.
The operating system is Windows Vista or a later version of Windows.

For more information, 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

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