IIS Web Core Notification - BeginRequest Handler Not yet determined Error Code 0x800700b7 Config Error Cannot add duplicate collection entry of type 'add' with unique key attribute 'name' set to 'ScriptHandlerFactory'

 

Situation

1. Visual studio 2008 SP1

2. IIS 7

3. Hosting WCF within site with a VDir.

This happens typically when you are hosting with hosting provider.

If you create a website in main folder (Which will be by default ) and you host a ASP.NET web site. Doesn't matter if it is AJAX or simple website. With SP1, we have 'ScriptHandlerFactory' with any web application.The site works perfectly.

 

Now if you are creating a service say a WCF service under a Vdir in this site, you will have a different Web.config for your service. Service will run fine locally. When hosted, The website will inherits the settings form parent level . This should be the reason of this issue. You can check if there is a web.fig file in the parent web content folder and an duplicate collection entry in it.

Typically a duplicate entry from services config needs to be removed.