Microsoft KB Archive/306165

= PRB: &quot;Unable to start debugging on the Web server&quot; error message when you debug ASP.NET applications =

Article ID: 306165

Article Last Modified on 3/29/2007

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APPLIES TO


 * Microsoft ASP.NET 1.1
 * 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 1.0
 * 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 2005 Standard Edition

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This article was previously published under Q306165



SYMPTOMS
When you debug an ASP.NET application in Visual Studio .NET, you may receive the following error message:

Error while trying to run project : Unable to start debugging on the web server. Would you like to disable future attempts to debug ASP.NET pages for this project?

In Visual Studio 2005 .NET, you receive the following error message:

Unable to start debugging on the web server. An authentication error occurred while communicating with the web server. Please see Help for assistance.



CAUSE
This error occurs because Microsoft Internet Information Server (IIS) is not running or is not functioning properly.



RESOLUTION
To resolve this problem, you must restart IIS. To do this, type iisreset at a command prompt.

Make sure that the IIS application is configured to use Integrated authentication so it will pass your credentials that are needed to launch the debugger. The anonymous account does not have sufficient permissions to perform debugging.

