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Web.config in Views subfolder ignored on developer machine, why?

I have an ASP.NET MVC application with a root web.config and a secondary Views/web.config added automatically by Visual Studio years ago when the application was created.
Now I have bumped ASP.NET MVC to a newer version (5.2.7), fixed various issues on my developer machine - and everything works for me.
Unfortunately, when pushed to our integration test server, everything fails as there are MVC version references, in the Views/web.config file, that are now invalid for the new MVC version.
I can fix the version issues and everything is 200 OK ... but, and here is my question, why doesn't the errors show up on my local developer machine?
It turns out I can introduce XML syntax errors and what not on my local machine - and nothing happens, everything is okay locally, as if the Views/web.config file is completely ignored by the webserver.
Both machines are running IIS on Windows with the same configuration ... well, except that something apparently is different.
Where should I look to figure out why the Views/web.config is ignored on my developer machine?
The Views/web.config looks like this (with the wrong version numbers included):
<?xml version="1.0"?>
<configuration>
<configSections>
<sectionGroup name="system.web.webPages.razor" type="System.Web.WebPages.Razor.Configuration.RazorWebSectionGroup, System.Web.WebPages.Razor, Version=3.0.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35">
<section name="host" type="System.Web.WebPages.Razor.Configuration.HostSection, System.Web.WebPages.Razor, Version=3.0.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35" requirePermission="false" />
<section name="pages" type="System.Web.WebPages.Razor.Configuration.RazorPagesSection, System.Web.WebPages.Razor, Version=3.0.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35" requirePermission="false" />
</sectionGroup>
</configSections>
<system.web.webPages.razor>
<host factoryType="System.Web.Mvc.MvcWebRazorHostFactory, System.Web.Mvc, Version=5.0.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35" />
<pages pageBaseType="System.Web.Mvc.WebViewPage">
<namespaces>
<add namespace="System.Web.Mvc" />
<add namespace="System.Web.Mvc.Ajax" />
<add namespace="System.Web.Mvc.Html" />
<add namespace="System.Web.Routing" />
<add namespace="CBrain.F2.SelfService.Mvc.Html" />
</namespaces>
</pages>
</system.web.webPages.razor>
<appSettings>
<add key="webpages:Enabled" value="false" />
</appSettings>
<system.web>
<compilation>
<assemblies>
<add assembly="System.Web.Mvc, Version=5.2.7.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35" />
</assemblies>
</compilation>
</system.web>
<system.webServer>
<handlers>
<remove name="BlockViewHandler"/>
<add name="BlockViewHandler" path="*" verb="*" preCondition="integratedMode" type="System.Web.HttpNotFoundHandler" />
</handlers>
</system.webServer>
</configuration>

Turns out that IIS behaves a bit strange: once the webpage loads correctly first time, I can change the Views/web.config without IIS detecting the change. But then I modify the main web.config ... whereafter IIS detects my changes in Views/web.config. Guess I have to live with that.

AjaxControlToolkit AjaxFileUpload can't upload IIS Reserved File Types

I am writing/ have written a file upload portal for my company that requires the ability to upload a ton of different file types of various sizes and quantities. I used the AJaxControlToolkit AjaxFileUpload control.
The upload works well except when we upload what seems like IIS reserved file types. We can upload images, entire non-zipped folders, office docs etc.
When I try to upload the reserved file type the Firefox developer tools returns a server error, 'File Extension Not Allowed' error. This happens with .exe files and the one we need .stl files(in our case these are for 3d printing).
We have played with config files, Handler Mappings, HTTP response headers, MIME type configurations, and request filtering on the IIS manager at the app level, site level and server level and none seem to work.
The last bit of info is that zipping the file seems to get it through but we'd like to avoid asking the customer to do that.
IIS 8.5,
C# .Net,
Windows Server 2012 R2
I can post code if you need it but I am pretty sure it is a server configuration we need to change
Thanks for your help.
Walt
Edit:
Below is my Config with the Fix included. this was an issue with white listed file types by the control and not the server. Thank you
<?xml version="1.0"?>
<configuration>
<configSections>
<section name="ajaxControlToolkit" type="AjaxControlToolkit.AjaxControlToolkitConfigSection, AjaxControlToolkit" requirePermission="false"/>
</configSections>
<appSettings/>
<ajaxControlToolkit additionalUploadFileExtensions="bmp,stl"></ajaxControlToolkit>
<system.webServer>
<handlers>
<add name="aa2" verb="*" path="AjaxFileUploadHandler.axd" type="AjaxControlToolkit.AjaxFileUploadHandler, AjaxControlToolkit"/>
</handlers>
</system.webServer>
<system.web>
<compilation debug="true">
<assemblies>
<add assembly="System.Web.Extensions, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35"/>
<add assembly="System.ServiceModel.Activation, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35"/>
<add assembly="System.Runtime.Serialization, Version=4.0.0.0, Culture=neutral, PublicKeyToken=B77A5C561934E089"/>
<add assembly="System.Web.ApplicationServices, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35"/>
<add assembly="System, Version=4.0.0.0, Culture=neutral, PublicKeyToken=B77A5C561934E089"/>
<add assembly="System.Web, Version=4.0.0.0, Culture=neutral, PublicKeyToken=B03F5F7F11D50A3A"/>
<add assembly="System.Configuration, Version=4.0.0.0, Culture=neutral, PublicKeyToken=B03F5F7F11D50A3A"/>
<add assembly="System.ServiceModel, Version=4.0.0.0, Culture=neutral, PublicKeyToken=B77A5C561934E089"/>
<add assembly="System.Xml, Version=4.0.0.0, Culture=neutral, PublicKeyToken=B77A5C561934E089"/>
<add assembly="System.Web.Services, Version=4.0.0.0, Culture=neutral, PublicKeyToken=B03F5F7F11D50A3A"/>
<add assembly="System.Data, Version=4.0.0.0, Culture=neutral, PublicKeyToken=B77A5C561934E089"/>
<add assembly="System.Core, Version=4.0.0.0, Culture=neutral, PublicKeyToken=B77A5C561934E089"/>
<add assembly="System.Data.Linq, Version=4.0.0.0, Culture=neutral, PublicKeyToken=B77A5C561934E089"/>
<add assembly="System.Drawing, Version=4.0.0.0, Culture=neutral, PublicKeyToken=B03F5F7F11D50A3A"/>
<add assembly="System.Windows.Forms, Version=4.0.0.0, Culture=neutral, PublicKeyToken=B77A5C561934E089"/>
<add assembly="System.Data.Services.Client, Version=4.0.0.0, Culture=neutral, PublicKeyToken=B77A5C561934E089"/>
<add assembly="System.Data.Services.Design, Version=4.0.0.0, Culture=neutral, PublicKeyToken=B77A5C561934E089"/>
<add assembly="System.Data.Entity, Version=4.0.0.0, Culture=neutral, PublicKeyToken=B77A5C561934E089"/>
<add assembly="System.Design, Version=4.0.0.0, Culture=neutral, PublicKeyToken=B03F5F7F11D50A3A"/>
</assemblies>
</compilation>
<pages>
<controls>
<add tagPrefix="ajaxToolkit" assembly="AjaxControlToolkit" namespace="AjaxControlToolkit"/>
</controls>
</pages>
</system.web>
</configuration>

You need to add the additionalUploadFileExtensions attribute to ajaxControlToolkit section in Web.config:
<ajaxControlToolkit additionalUploadFileExtensions="exe,stl" />
Please refer to this article: https://github.com/DevExpress/AjaxControlToolkit/wiki/AjaxFileUpload-setup

For an example of where to ajaxcontroltoolkit entry in the web.config file, please refer to Sample web.config Ajax configuration
Sample below:
<configuration>
<configSections>
<section name="ajaxControlToolkit" type="AjaxControlToolkit.AjaxControlToolkitConfigSection, AjaxControlToolkit" requirePermission="false"/>
</configSections>
<ajaxControlToolkit
useStaticResources="true"
renderStyleLinks="false"
htmlSanitizer="AjaxControlToolkit.HtmlEditor.Sanitizer.DefaultHtmlSanitizer, AjaxControlToolkit.HtmlEditor.Sanitizer"
tempFolder="~/Temp"/>
<location path="Temp">
<system.webServer>
<handlers>
<clear/>
</handlers>
<modules>
<clear/>
</modules>
</system.webServer>
</location>
<system.web>

Trying to add "Free Text Box" to a web.config file

So, I added a FTB by using a Formview that connects the database to the webpage.
When I tried to run the page and use the FTB, I was greeted with the following message:
"FreeTextBox has not been correctly installed. To install FreeTextBox either:
(1) add a reference to FtbWebResource.axd in web.config:
<system.web>
<httpHandlers>
<add verb="GET"
path="FtbWebResource.axd"
type="FreeTextBoxControls.AssemblyResourceHandler, FreeTextBox" />
</httpHandlers>
</system.web>
(2) Save the FreeTextBox image and javascript files to a location on your website and set up FreeTextBox as follows
<FTB:FreeTextBox id="FreeTextBox1" SupportFolder="ftbfileslocation" JavaScriptLocation="ExternalFile" ButtonImagesLocation="ExternalFile" ToolbarImagesLocation="ExternalFile" ButtonImagesLocation="ExternalFile" runat="server" />"
I have already gone to the FTB download site and acquired the DLL. I created a bin folder in Visual Studio 2013 Exp and added the DLL to the file.
My web config currently looks like this:
<?xml version="1.0"?>
<configuration>
<connectionStrings>
<add name="ConnectionString" connectionString="Data Source=.\SQLEXPRESS;AttachDbFilename=|DataDirectory|\PageContent.mdf;Integrated Security=True;User Instance=True" providerName="System.Data.SqlClient"/>
</connectionStrings>
<system.web>
<httpRuntime requestValidationMode="2.0"/>
<httpHandlers>
<add verb="GET"
path="FtbWebResource.axd"
type="FreeTextBoxControls.AssemblyResourceHandler, FreeTextBox"/>
</httpHandlers>
<compilation debug="true" targetFramework="4.0">
<assemblies>
<add assembly="System.Web.DynamicData, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35"/>
<add assembly="System.Core, Version=4.0.0.0, Culture=neutral, PublicKeyToken=B77A5C561934E089"/>
<add assembly="System.ComponentModel.DataAnnotations, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35"/>
<add assembly="System.Data.Linq, Version=4.0.0.0, Culture=neutral, PublicKeyToken=B77A5C561934E089"/>
<add assembly="System.Data.Entity, Version=4.0.0.0, Culture=neutral, PublicKeyToken=B77A5C561934E089"/>
<add assembly="System.Web.Entity, Version=4.0.0.0, Culture=neutral, PublicKeyToken=B77A5C561934E089"/>
<add assembly="System.Xml.Linq, Version=4.0.0.0, Culture=neutral, PublicKeyToken=B77A5C561934E089"/>
</assemblies>
</compilation>
</system.web>
<system.webServer>
<validation validateIntegratedModeConfiguration="false"/>
</system.webServer>
</configuration>
Does anyone have any idea what I am doing wrong?

If you are using IIS 7 and above you might want to register it in the handlers section of the System.webServer section.
<system.webServer>
<validation validateIntegratedModeConfiguration="false"/>
<handlers>
<add name="FreeTextBox" path="FtbWebResource.axd" verb="GET" type="FreeTextBoxControls.AssemblyResourceHandler, FreeTextBox" preCondition="integratedMode" />
</handlers>
</system.webServer>

The system cannot find the file specified:System.ComponentModel.Win32Exception

i have hosted my web application here
http://amit12x-001-site1.smarterasp.net/PageCommon/login.aspx
but when i try to login then it show this , while when i running my project in visual studio then i'm not getting any error.
i think this is problem with database connectivity, as when i try to register i'm getting same error
The system cannot find the file specified
Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.
Exception Details: System.ComponentModel.Win32Exception: The system cannot find the file specified
Source Error:
An unhandled exception was generated during the execution of the current web request. Information regarding the origin and location of the exception can be identified using the exception stack trace below.
this is my web.config code
<!--
For more information on how to configure your ASP.NET application, please visit
http://go.microsoft.com/fwlink/?LinkId=169433
-->
<configuration>
<connectionStrings>
<add name="connect" connectionString="server=.;database=OnlineLibrary;uid=sa;pwd=12345"/>
</connectionStrings>
<system.web>
<customErrors mode="Off"/>
<compilation debug="true" targetFramework="4.5">
<assemblies>
<add assembly="System.Design, Version=4.0.0.0, Culture=neutral, PublicKeyToken=B03F5F7F11D50A3A"/>
<add assembly="System.Windows.Forms, Version=4.0.0.0, Culture=neutral, PublicKeyToken=B77A5C561934E089"/>
<add assembly="System.Web.Extensions.Design, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35"/>
<add assembly="System.DirectoryServices, Version=4.0.0.0, Culture=neutral, PublicKeyToken=B03F5F7F11D50A3A"/>
<add assembly="Microsoft.SqlServer.Smo, Version=11.0.0.0, Culture=neutral, PublicKeyToken=89845DCD8080CC91"/>
<add assembly="Microsoft.SqlServer.SmoExtended, Version=11.0.0.0, Culture=neutral, PublicKeyToken=89845DCD8080CC91"/>
<add assembly="Microsoft.SqlServer.ConnectionInfo, Version=11.0.0.0, Culture=neutral, PublicKeyToken=89845DCD8080CC91"/>
<add assembly="Microsoft.SqlServer.ConnectionInfoExtended, Version=11.0.0.0, Culture=neutral, PublicKeyToken=89845DCD8080CC91"/>
<add assembly="Microsoft.SqlServer.Management.Sdk.Sfc, Version=11.0.0.0, Culture=neutral, PublicKeyToken=89845DCD8080CC91"/>
</assemblies>
</compilation>
<httpRuntime targetFramework="4.5"/>
<authentication mode="Forms">
<forms loginUrl="~/PageUser/login.aspx" timeout="2880"/>
</authentication>
<membership>
<providers>
<clear/>
<add name="AspNetSqlMembershipProvider" type="System.Web.Security.SqlMembershipProvider" connectionStringName="connect" enablePasswordRetrieval="false" enablePasswordReset="true" requiresQuestionAndAnswer="true" requiresUniqueEmail="true" maxInvalidPasswordAttempts="5" minRequiredPasswordLength="6" minRequiredNonalphanumericCharacters="0" passwordAttemptWindow="10" applicationName="/"/>
</providers>
</membership>
<profile>
<providers>
<clear/>
<add name="AspNetSqlProfileProvider" type="System.Web.Profile.SqlProfileProvider" connectionStringName="connect" applicationName="/"/>
</providers>
</profile>
<roleManager enabled="true">
<providers>
<clear/>
<add name="AspNetSqlRoleProvider" type="System.Web.Security.SqlRoleProvider" connectionStringName="connect" applicationName="/"/>
<add name="AspNetWindowsTokenRoleProvider" type="System.Web.Security.WindowsTokenRoleProvider" applicationName="/"/>
</providers>
</roleManager>
</system.web>
<appSettings>
<add key="ValidationSettings:UnobtrusiveValidationMode" value="None"/>
</appSettings>
</configuration>

AJAX.NET not working

I am using AJAX Asynchronous Triggers. I created a project in VS2010 and everything worked fine. When I uploaded the same code to my server AJAX functionality stopped working. I installed AJAX extension for .NET but still the issue persists. My web.config file follows
<configuration>
<system.webServer>
<httpRuntime maxRequestLength="32768" executionTimeout="3600"/>
<httpModules>
<add name="ScriptModule" type="System.Web.Handlers.ScriptModule, System.Web.Extensions, Version=1.0.61025.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35"/>
</httpModules>
<compilation defaultLanguage="c#" debug="false">
<assemblies>
<add assembly="System.Web.Extensions, Version=1.0.61025.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35"/>
</assemblies>
</compilation>
<customErrors mode="Off" />
<pages enableEventValidation="false" enableViewState="false" enableViewStateMac="false">
<controls>
<add tagPrefix="asp" namespace="System.Web.UI" assembly="System.Web.Extensions, Version=1.0.61025.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35" />
<add tagPrefix="asp" namespace="System.Web.UI.WebControls" assembly="System.Web.Extensions, Version=1.0.61025.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35"/>
</controls>
</pages>
</system.webServer>
</configuration>
When I add handlers/httpHandlers to my web.config file I am getting 500-Internal server error.
<handlers>
<add verb="GET,HEAD" path="ScriptResource.axd" type="System.Web.Handlers.ScriptResourceHandler, System.Web.Extensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35" validate="false" />
</handlers>

you should first check framework installed on your web server.
according to your web config your application is in framework 1.0 but you added handler of framework 3.5.
Update
please updated you handler section and upload again and then check.
hi mad coder update your config with this code and check again
<configuration>
<compilation defaultLanguage="c#" debug="false">
<assemblies>
<add assembly="System.Web.Extensions, Version=1.0.61025.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35"/>
</assemblies>
</compilation>
</configuration>
and add this handler to your web config
<handlers>
<add verb="GET,HEAD" path="ScriptResource.axd" type="System.Web.Handlers.ScriptResourceHandler, System.Web.Extensions, Version=1.0.61025.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" validate="false"/>
</handlers>

For .NET 2.0, ASP.NET AJAX 1.0 is used. Write correct assembly version to HttpHandlers in web.config. See the documentation: Configuring ASP.NET AJAX