Microsoft KB Archive/306163

= PRB: &quot;Unable to Start Debugging&quot; Error Message When You Send Debug HTTP Request =

Article ID: 306163

Article Last Modified on 7/8/2003

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APPLIES TO


 * Microsoft ASP.NET 1.1
 * Microsoft Visual Studio .NET 2003 Professional Edition
 * Microsoft Visual Studio .NET 2003 Enterprise Architect
 * Microsoft Visual Studio .NET 2003 Enterprise Developer
 * Microsoft Visual Studio .NET 2003 Academic Edition
 * Microsoft ASP.NET 1.0
 * Microsoft Visual Studio .NET 2002 Professional Edition
 * Microsoft Visual Studio .NET 2002 Enterprise Architect
 * Microsoft Visual Studio .NET 2002 Enterprise Developer
 * Microsoft Visual Studio .NET 2002 Academic Edition

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This article was previously published under Q306163



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. Server-side error occurred on sending debug HTTP request.

Make sure the server is operating correctly. Verify there are no syntax errors in web.config by doing a Debug.Start without debugging. You may also want to refer to the ASP.NET and ATL Server debugging topic in the online documentation. Would you like to disable future attempts to debug ASP.NET pages for this project?



CAUSE
This problem can occur if there are syntax errors in the ASP.NET application's Web.config file.



RESOLUTION
To resolve this problem, make sure that all of the Extensible Markup Language (XML) in the Web.config file is valid and well formed. Also, remember that everything in Web.config is case-sensitive.

Keywords: kberrmsg kbweb kbdebug kbprb kbconfig KB306163

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