An ASP.NET Setting Has Been Detected That Does Not Apply in Integrated Managed Pipeline Mode

An ASP.NET setting has been detected that does not apply in Integrated managed pipeline mode

The 2^nd option is the one you want.

In your web.config, make sure these keys exist:

<configuration>
    <system.webServer>
        <validation validateIntegratedModeConfiguration="false"/>
    </system.webServer>
</configuration>

An ASP.NET setting has been detected that does not apply in Integrated managed pipeline mode.(the project does not even run locally)

Removing the following line from the web.config file fixed the issue for me.

<system.web>
    <httpHandlers>
      <add path="*.less" verb="GET" type="dotless.Core.LessCssHttpHandler, dotless.Core" />
    </httpHandlers>
  </system.web>

HTTP Error 500.24 - Internal Server Error An Asp.NET setting has been detected that does not apply in Integrated managed pipeline mode

Your error is specifically to do with 'client impersonation'. I had the same error on one machine but not on another. By comparing settings I worked out the difference.

Start IIS Manager. Select the server in the left pane and double click 'Authentication' under the IIS group in the central pane. Select ASP.NET Impersonation and select 'Disable' at the top of the right pane.

How to fix HTTP Error 500.22 - Internal Server Error An ASP.NET setting has been detected that does not apply in Integrated managed pipeline mode

Chk my SO Post

Finally, I'm able to crack it for VS.Net 2015 and its configuration of IISExpress. ITs not possible to configure it 'externally' and nothing will work if you keep modifying IIS or IISExpress settings outside VS.Net.

It took me a while to narrow down my focus to VS.Net proj properties and configurations. I found that VS.Net created its own version of "applicationhost.config" which can be found at -

<myProject.sln path> \.vs\config\applicationhost.config

This is the file in which I had to change the application pool (applicationPool="Clr4ClassicAppPool) -

    <sites>
        <site name="WebSite1" ... ignore this sction if present
        </site>
        <site name="myProject" id="2">
            <application path="/" applicationPool="Clr4ClassicAppPool">
                <virtualDirectory path="/" physicalPath="D:\Source\myProject" />
            </application>
            <bindings>
                <binding protocol="http" bindingInformation="*:1960:localhost" />
            </bindings>
        </site>

You just need to change the applicationPool (your Classic App pool name might be diff in that case get the correct one from in the same file). Also make sure you're updating the correct "site" node (the correct localhost url of your web app when debugged from VS.Net)

If still there's an issue set the following -

<applicationDefaults applicationPool="Clr4IntegratedAppPool" />

Hope this helps.

Integrated managed pipeline mode Error in VS15

I just Added the following lines in web.config file under configuration TAG :

 <system.webServer>
    <validation validateIntegratedModeConfiguration="false"/>
  </system.webServer>

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