Steps to Investigate Cause of Web.Config Duplicate Section

Posted by pauly on Stack Overflow See other posts from Stack Overflow or by pauly
Published on 2010-03-19T06:14:57Z Indexed on 2010/03/19 6:21 UTC
Read the original article Hit count: 331

Filed under:

iis7

|

ASP.NET

|

asp.net-mvc

Symptoms

In IIS Dot Net 2.0 Integrated app pool: double clicking to view any web.config section results in a the following error dialog. "There was an error while performing this operation.... Fielname... web.config... Error: There is a duplicate..."
Browsing to the URL displays: "Http 500.19" internal server error.. There is a duplicate... 'system.web.extensions/scripting/scriptResourceHandler' section defined...."
Running the app from VS 2008 an "Unable to start debugging on the web server..." dialog is displayed.

Things Tried

Looked at other application directories on same IIS server. No problem view web.config contents or serving up the app.
Removed and re-added the application in IIS.
Checked out a new version of the source code.
Reverted to prior versions of the web.config file.
Looked for web.config files that might have duplicate sections in:
- Inetpub root.
- "C:\Windows\Microsoft.NET\Framework\v2.0.50727\CONFIG\machine.config"
- The "Views" subfolder of the ASP.Net MVC app.
Checked out source code to another dev machine. Setup IIS 7 app folder. No problem with Web.config.

Question

If the reason for this error is another web.config file where else should I look?
Are there other reasons for these symptoms?

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