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PRB: Cannot Debug ASP.NET Web Application
| Article ID | : | 318465 |
| Last Review | : | March 27, 2007 |
| Revision | : | 4.4 |
This article was previously published under Q318465
SYMPTOMS
When you debug an ASP.NET application in Microsoft Visual
Studio .NET, you may receive the following Microsoft Development Environment
error message:
Error while trying to run project: Unable
to start debugging on the web server. The server does not support debugging of
ASP.NET or ATL Server applications. Run setup to install the Visual Studio .NET
server components. If setup has been run, verify that a valid URL has been
specified.
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?
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CAUSE
This error may occur if the Microsoft .NET Framework setup
or installation was not completed correctly. When this occurs, the application
mappings for ASP.NET file name extensions (such as .aspx) are not configured
correctly in Microsoft Internet Information Services (IIS).
To check
whether the application mappings are correct, follow these steps:
| 1. | Click Start, point to Programs, point to Administrative Tools, and then click Internet Services Manager. |
| 2. | Expand the node that corresponds to the local host
(computer name), and then expand the Default Web Site node. |
| 3. | Right-click your Web application directory, and then click Properties. |
| 4. | On the Directory tab, under Application Settings, click Configuration. |
| 5. | Click the App Mappings tab. |
| 6. | On the App Mappings tab, under Application Mappings, check whether the .aspx extension is mapped to the following
dynamic-link library (DLL):
C:\Windows Directory\Microsoft.Net\Framework\<Version>\aspnet_isapi.dll
NOTE: You must replace Windows Directory in
this path with the correct directory for your system and replace
Version with the version of the .NET Frame work
installed on your system. |
| 7. | If the application mapping entry is not found, follow the
steps in the "Resolution" section. |
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RESOLUTION
To resolve this problem, use the Aspnet_regiis.exe
administration utility that manages the installation and uninstallation of
multiple versions of ASP.NET on a single computer.
To use the
Aspnet_regiis.exe utility, follow these steps:
| 1. | Click Start, and then click Run. |
| 2. | Type cmd in the Open box, and then click OK to open a command prompt. |
| 3. | At the command prompt, use the cd command to change to the following directory:
C:\Windows Directory\Microsoft.Net\Framework\Version Note: You must replace Windows Directory in
this path with the correct directory for your system and replace
Version with the version of the .NET Frame work
installed on your system. |
| 4. | Type aspnet_regiis -i to configure
the required application mappings correctly. |
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REFERENCES
For additional information about other ASP.NET debugging
problems, click the article number below to view the article in the Microsoft
Knowledge Base:
306172 (http://kbalertz.com/Feedback.aspx?kbNumber=306172/EN-US/) INFO: Common Errors When You Debug ASP.NET Applications in Visual Studio .NET
For a description of symptoms typically related to
ASP.NET and IIS application mappings that are not configured properly, see
Microsoft Knowledge Base article Q325093.
325093 (http://kbalertz.com/Feedback.aspx?kbNumber=325093/EN-US/) PRB: ASP.NET Pages Exhibit Unexpected Behavior Because the Server-Side Code Is Not Processed
For more information about ASP.NET debugging, see
the following MSDN Web site:
For more general information about ASP.NET, see the following
MSDN newsgroup:
microsoft.public.dotnet.framework.aspnet (http://msdn.microsoft.com/newsgroups/default.aspx?query=ASP.NET&dg=&cat=en-us-msdn&lang=en&cr=US&pt=&catlist=774F24A2-F71F-425F-AC2B-DC48AB0DA5C9&dglist=&ptlist=&exp=&sloc=en-us) Back to the top
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 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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