IIS 7.5 & default.aspx pages

I have a website running off of IIS 7.5, one of the sub folders in the root directory has a default.aspx page that I would like to be displayed whenever someone navigates to said sub folder (e.g www.mainsite.com/subfolder ) However instead of the default.aspx page being displayed the user is presented with a 404 page cannot be found error page.

The default.aspx page has been added to the default page's property page and has even been moved to the top of the list. Is there something else that needs to be configured so that the default.aspx page I want to display is displayed? Do I need to convert this sub folder into an application in order to get this functionality?
dowhatyoudo22Asked:
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Big MontyWeb Ninja at largeCommented:
Do I need to convert this sub folder into an application in order to get this functionality?

i believe so, yes

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Dan McFaddenSystems EngineerCommented:
Is the default document in the root configuration something other than "default.aspx" ?

If it is, the I agree with BM.

But realize that you will need to be careful with the root and child virtual application configuration being inherited.  Meaning, you should be aware that a virtual application uses its own web.config.  If there are things in the root app that you do not want to be passed (inherited) by the virtual application, you will need to override them in the virtual app's web.config.

reference links:
1. https://msdn.microsoft.com/en-us/library/ms178685.aspx
2. http://blogs.iis.net/steveschofield/control-web-config-inheritance-with-iis-7-asp-net-options

Dan
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