My WebApi works fine on Visual Studio but doesn't work on IIS

There are several questions I could find on SO and over the internet. However, they weren't the solution to my problem (at least the solutions I've seen so far). Therefore, I need your help.

I created WebApi

with the following lists, which works great when I run it from Visual Studio. But it doesn't work when I publish this to IIS on my own machine.

This gives me HTTP error 404.0 - No error found.

• Operating system: Windows 7
• IDE: Visual Studio 2013
• IIS: version 7.5

This system.webServer

and the applicationSettings

part web.config

:

          <system.webServer>
            <validation validateIntegratedModeConfiguration="false"/>
            <modules runAllManagedModulesForAllRequests="true"/> 
            <handlers>
              <remove name="ExtensionlessUrlHandler-Integrated-4.0" />
              <remove name="OPTIONSVerbHandler" />
              <remove name="TRACEVerbHandler" />
              <add name="ExtensionlessUrlHandler-Integrated-4.0" path="*." verb="*"
     type="System.Web.Handlers.TransferRequestHandler" 
preCondition="integratedMode,runtimeVersionv4.0" />
            </handlers>
          </system.webServer>
          <applicationSettings>
            <SampleAspNetWebApi.Properties.Settings>
              <setting name="AuthorityAddress" serializeAs="String">
                <value>https://localhost:44333/core</value>
              </setting>
              <setting name="SampleAspNetWebApi_SmsPanel_SMS" serializeAs="String">
                <value>http://something.com/smsws/soap.asmx</value>
              </setting>
            </SampleAspNetWebApi.Properties.Settings>
          </applicationSettings>

      

        
        
        
      

    

This is the routing map:

    config.Routes.MapHttpRoute(
        name: "DefaultApi",
        routeTemplate: "{controller}/{action}",
        defaults: new { id = RouteParameter.Optional }
    );

      

        
        
        
      

    

Finally, this is my controller, which I created for testing purposes only:

public class TestController : ApiController
{
    public string Get()
    {
        return "Just for test";
    }
}

      

        
        
        
      

    

UPDATE: