Microsoft KB Archive/894433

= You may receive an &quot;Access is denied&quot; error message when you try to debug a Web application in Visual Studio .NET, and you have administrative permissions =

Article ID: 894433

Article Last Modified on 5/18/2007

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APPLIES TO


 * Microsoft Visual Studio .NET 2002 Academic Edition
 * Microsoft Visual Studio .NET 2002 Enterprise Architect
 * Microsoft Visual Studio .NET 2002 Enterprise Developer
 * Microsoft Visual Studio .NET 2002 Professional Edition
 * Microsoft Visual Studio .NET 2003 Academic Edition
 * Microsoft Visual Studio .NET 2003 Enterprise Architect
 * Microsoft Visual Studio .NET 2003 Enterprise Developer
 * Microsoft Visual Studio .NET 2003 Professional Edition
 * Microsoft ASP.NET 1.1
 * Microsoft ASP.NET 1.0
 * Microsoft Windows XP Service Pack 2

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SYMPTOMS
You may receive the following error message when you try to debug a Web application:

Access is Denied

The problem occurs when the following conditions are true:
 * You are logged on to your computer with administrative permissions.
 * You are debugging a Web application in Microsoft Visual Studio .NET.
 * The operating system that you are using is Microsoft Windows XP Service Pack 2.
 * The Microsoft ASP.NET worker process account is not a member of the Administrators group.



CAUSE
The problem occurs because the ASP.NET worker process does not have the Impersonate a client after authentication user right. If the worker process account does not have this right, the debugger cannot attach to the process. The worker process account is configured by using the processModel element in the Machine.config file.



RESOLUTION
To give the worker process account the Impersonate a client after authentication user right, follow these steps:  Click Start, point to Settings, and then click Control Panel. Double-click Administrative Tools. Double-click Local Security Policy. Expand Security Setting, expand Local Policies, and then click User Rights Assignment. In the Policy pane, right-click Impersonate a client after authentication, and then click Properties. Click Add User or Group.</li> Add the worker process account that is configured in the processModel element in the Machine.config file.</li> Click OK two times.</li> Click Start, click Run, type iisreset, and then click OK.</li> At a command prompt, type the following command to refresh policies on the computer:

gpupdate /force

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Steps to reproduce the problem
<ol> Open the Machine.config file. Locate the processModel element.</li> Replace the username attribute and the password attribute as a non-administrative user.</li> Restart Internet Information Services (IIS).</li> Log off your computer. Log on your computer so that you have administrative permissions.</li> Start Visual Studio .NET.</li> Create a new Web application.

When you try to debug the Web application, you may receive the following error message:

Error while trying to run project: Unable to start debugging on the web server. Access is denied.

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