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: 312

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?

© Stack Overflow or respective owner

Related posts about iis7

Configuring IIS7 404 page when using IIS7 urlrewrite module

as seen on Pro Webmasters - Search for 'Pro Webmasters'
I've got custom errors to work for .aspx page like: www.domain.com/whateverdfdgdfg.aspx But, when no .aspx url is requested, (like http://www.domain.com/hfdkfdh4545) it results in an error: HTTP Error 404.0 - Not Found The resource you are looking for has been removed, had its name changed… >>> More
How to create a Subdomain in IIS7?

as seen on Server Fault - Search for 'Server Fault'
In IIS7 I have a site: http://www.mydomain.com/mysite How can I get the same site to appear as: http://mysite.mydomain.com ? I already have the DNS set up and can ping it, I just do not know how to configure it in IIS7. >>> More
How can I control which IP address IIS7 uses?

as seen on Server Fault - Search for 'Server Fault'
In Win2k3 I used httpcfg to tell IIS to listen to specific IP addresses on the server. I want to run Apache with VisualSVN Server on port 80 on another IP address but IIS7 binds to all ports by default. What utility for IIS7 controls the IIS7 bindings? Update: I found the answer. There is a utility… >>> More
WCF service hosted in IIS7 with administrator rights?

as seen on Server Fault - Search for 'Server Fault'
Hello, How do I grant administrator rights to a running WCF service hosted in IIS7? The problem is, my code works fine in a test console application runned as an administrator, but the same code used from WCF service in IIS7 fails. When I run the same console test application without admin rights… >>> More
authentication problem on windows vista (cookie is getting written but httpcontext.current.user is n

as seen on Stack Overflow - Search for 'Stack Overflow'
authentication problem on windows vista (iis7) (cookie is getting written but httpcontext.current.user is null) >>> More

Related posts about ASP.NET

Migrating ASP.NET MVC 1.0 applications to ASP.NET MVC 2 RTM

as seen on ASP.net Weblogs - Search for 'ASP.net Weblogs'
Note: ASP.NET MVC 2 RTM isn’t yet released! But this tool will help you get your ASP.NET MVC 1.0 applications ready for when it is! I have updated the MVC App Converter to convert projects from ASP.NET MVC 1.0 to ASP.NET MVC 2 RTM. This should be last the last major change to the MVC App Converter… >>> More
April 14th Links: ASP.NET, ASP.NET MVC, ASP.NET Web API and Visual Studio

as seen on ASP.net Weblogs - Search for 'ASP.net Weblogs'
Here is the latest in my link-listing blog series: ASP.NET Easily overlooked features in VS 11 Express for Web: Good post by Scott Hanselman that highlights a bunch of easily overlooked improvements that are coming to VS 11 (and specifically the free express editions) for web development: unit… >>> More
Use ASP.NET 4 Browser Definitions with ASP.NET 3.5

as seen on ASP.net Weblogs - Search for 'ASP.net Weblogs'
We updated the browser definitions files included with ASP.NET 4 to include information on recent browsers and devices such as Google Chrome and the iPhone. You can use these browser definition files with earlier versions of ASP.NET such as ASP.NET 3 Read More......(read more) >>> More
ASP.NET webforms + ASP.NET Ajax versus ASP.NET MVC and Ajax framework freedom

as seen on Stack Overflow - Search for 'Stack Overflow'
If given the choice, which path would you take? ASP.NET Webforms + ASP.NET AJAX or ASP.NET MVC + JavaScript Framework of your Choice Are there any limitations that ASP.NET Webforms / ASP.NET AJAX has vis-a-vis MVC? >>> More
ASP.NET MVC 2 Released

as seen on ASP.net Weblogs - Search for 'ASP.net Weblogs'
I’m happy to announce that the final release of ASP.NET MVC 2 is now available for VS 2008/Visual Web Developer 2008 Express with ASP.NET 3.5. You can download and install it from the following locations: Download ASP.NET MVC 2 using the Microsoft Web Platform Installer Download… >>> More