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 enabled”

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.

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.

RESOLUTION

Hotfix information

A supported hotfix is now available from Microsoft. However, it is intended to correct only the problem that is described in this article. Apply it only to systems that are experiencing this specific problem. This hotfix may receive additional testing. Therefore, if you are not severely affected by this problem, we recommend that you wait for the next Visual Studio 2005 service pack that contains this hotfix.

To resolve this problem immediately, contact Microsoft Customer Support Services to obtain the hotfix.

Note In special cases, charges that are ordinarily incurred for support calls may be canceled if a Microsoft Support Professional determines that a specific update will resolve your problem. The usual support costs will apply to additional support questions and issues that do not qualify for the specific update in question.

Additionally, you can obtain this hotfix by visiting the following Microsoft Web site:

https://connect.microsoft.com/VisualStudio/Downloads/DownloadDetails.aspx?DownloadID=7250 (https://connect.microsoft.com/VisualStudio/Downloads/DownloadDetails.aspx?DownloadID=7250)

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.

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

STATUS

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

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.

APPLIES TO
Microsoft Visual Studio 2005 Service Pack 1
Microsoft Visual Studio 2005 Standard Edition
Microsoft Visual Studio 2005 Professional Edition
Microsoft Visual Studio 2005 Express Edition
Microsoft Visual Studio 2005 Team Edition for Software Architects
Microsoft Visual Studio 2005 Team Edition for Software Developers
Microsoft Visual Studio 2005 Team Edition for Software Testers
Windows Vista Home Basic
Windows Vista Home Premium
Windows Vista Home Basic 64-bit Edition
Windows Vista Home Premium 64-bit Edition
Microsoft Internet Information Services 7.0

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Microsoft Knowledge Base Article

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