ASP.NET target 4.5

Another thing you can try is setting the "Run All Managed Modules for All Requests" option under in your applicaiton's Web.config.

  <system.webServer>
    <modules runAllManagedModulesForAllRequests="true"></modules>
    <handlers>
      <remove name="UrlRoutingHandler"/>
    </handlers>
  </system.webServer>

You need the managed modules to run on incoming requests if you require Forms Authentication to access your application, because Forms Authentication is a managed module. So if you're requiring Forms Authentication, but that module isn't running, IIS just gives a 403 error because it can't get you the kind of authentication the application requires.

default 

  <system.webServer>
    <handlers>
      <remove name="UrlRoutingHandler"/>
      <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>
    <validation validateIntegratedModeConfiguration="false" />
    <modules runAllManagedModulesForAllRequests="true">
      <remove name="ApplicationInsightsWebTracking" />
      <add name="ApplicationInsightsWebTracking" type="Microsoft.ApplicationInsights.Web.ApplicationInsightsHttpModule, Microsoft.AI.Web" preCondition="managedHandler" />
    </modules>
  </system.webServer>
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