Custom 401 Error Working Locally but not on server - asp.net-mvc-4

Question

I have defined my Custom Error pages in my global.asax.cs and can get them working locally in IIS Express with VS 2013, but when I publish to the server running IIS 7 the 401 and 403 errors do not display the custom error page but rather return a 500 and not the custom 500 page either. I've tried many solutions found here on SO but none have worked. Anyone have any thoughts?
Web.Config portions:
<system.web>
<customErrors mode="On" defaultRedirect="~/Error">
</customErrors>
</system.web>
<system.webServer>
<httpErrors existingResponse="PassThrough" />
</system.webServer>
Global.asax portions:
protected void Application_Error()
{
string descriptor = null;
string errMsg = null;
string additionalInfo = null;
string title = null;
Exception lastError = null;
Exception ex = null;
if (HttpContext.Current.Server.GetLastError() != null)
{
ex = HttpContext.Current.Server.GetLastError().GetBaseException();
if (ex.GetType() == typeof (HttpException))
{
HttpException httpException = (HttpException) ex;
switch (httpException.GetHttpCode())
{
case 404:
title = "Not Found";
descriptor = "Page Not Found";
errMsg =
"The page you requested could not be found, either contact your webmaster or try again. Use your browsers Back button to navigate to the page you have prevously come from.";
additionalInfo =
"We are working hard to correct this issue. Please wait a few moments and try your search again.";
lastError = new Exception(errMsg);
break;
case 500:
title = "Server Error";
descriptor = "Oooops, Something went wrong!";
errMsg = "You have experienced a technical error. We apologize.";
additionalInfo =
"We are working hard to correct this issue. Please wait a few moments and try your search again.";
lastError = new Exception(errMsg);
break;
}
CallErrorController(descriptor, additionalInfo, title, lastError, httpException.GetHttpCode());
}
}
}
protected void Application_EndRequest(object sender, EventArgs e)
{
if (Response.StatusCode == 401 || Response.StatusCode == 403)
{
Response.ClearContent();
string additionalInfo = null;
string title = null;
const string errMsg =
#"You have attempted to access a resource for which you do not have the proper authorization or which is not available from your location.
If you received this message by clicking on a link on this website, please report it to the webmaster. Use your browsers Back
button to navigate to the page you have previously come from.";
const string descriptor = "Access is Denied";
title = descriptor;
Exception lastError = new Exception(errMsg);
CallErrorController(descriptor, additionalInfo, title, lastError, Response.StatusCode);
}
}
private void CallErrorController(string descriptor, string additionalInfo, string title, Exception lastError, int statusCode)
{
Server.ClearError();
Response.TrySkipIisCustomErrors = true;
HttpContextWrapper contextWrapper = new HttpContextWrapper(this.Context);
RouteData routeData = new RouteData();
routeData.Values.Add("controller", "Error");
routeData.Values.Add("action", "Index");
routeData.Values.Add("statusCode", statusCode);
routeData.Values.Add("exception", lastError);
routeData.Values.Add("descriptor", descriptor);
routeData.Values.Add("additionalInfo", additionalInfo);
routeData.Values.Add("title", title);
routeData.Values.Add("isAjaxRequet", contextWrapper.Request.IsAjaxRequest());
IController controller = new ErrorController();
RequestContext requestContext = new RequestContext(contextWrapper, routeData);
controller.Execute(requestContext);
Response.End();
}
ErrorController:
public class ErrorController : Controller
{
public ActionResult Index(int statusCode, Exception exception, string descriptor, string additionalInfo, string title, bool isAjaxRequet)
{
if (!isAjaxRequet)
{
ErrorModel model = new ErrorModel { HttpStatusCode = statusCode, Exception = exception, Descriptor = descriptor, AdditionalInfo = additionalInfo, Title = title};
return View("Error", model);
}
else
{
// Otherwise, if it was an AJAX request, return an anon type with the message from the exception
var errorObjet = new { message = exception.Message };
return Json(errorObjet, JsonRequestBehavior.AllowGet);
}
}
}
Running Locally:
Running From the Server:

Answer 1

Try adding this to your web.config
<configuration>
... //all the other gubbins that goes in your web config
<system.webServer>
<httpErrors errorMode="Detailed" />
</system.webServer>
</configuration>
Or turning on detailed errors via the iis adamin module