Question

Earlier I had similar issue.
I have created asp mvc default template project and set authorization attribute on home controller.
When I run app url is:

http://localhost:48403/Account/LogOn?ReturnUrl=%2f

what I try to get is just http://localhost:48403 when user is no authenticated but I just have no luck with reouting setup 🙁
I have tried to put this in global.asax but no luck:

routes.MapRoute("Login", "",
                 new { controller = "Account", action = "LogOn" }
             );

This is my whole global.asax

routes.MapRoute("About", "About",
                 new { controller = "Home", action = "About" }
             );

            routes.MapRoute("Login", "",
                 new { controller = "Account", action = "LogOn" }
             );

            routes.MapRoute(
                "Default", // Route name
                "{controller}/{action}/{id}", // URL with parameters
                new { controller = "Home", action = "Index", id = UrlParameter.Optional } // Parameter defaults
            );

Answer 1

You could write a custom Authorize attribute which instead if redirecting will directly render the LogOn view:

public class MyAuthorizeAttribute : AuthorizeAttribute
{
    protected override void HandleUnauthorizedRequest(AuthorizationContext filterContext)
    {
        var viewResult = new ViewResult
        {
            ViewName = "~/Views/Account/LogOn.cshtml"
        };
        filterContext.Result = viewResult;
    }
}

then decorate your HomeController with it:

[MyAuthorize]
public class HomeController : Controller
{
    public ActionResult Index()
    {
        return View();
    }
}

then your AccountController does no longer need to worry about ReturnUrls:

public class AccountController : Controller
{
    [HttpPost]
    public ActionResult LogOn(LogOnModel model)
    {
        if (ModelState.IsValid)
        {
            if (Membership.ValidateUser(model.UserName, model.Password))
            {
                FormsAuthentication.SetAuthCookie(model.UserName, model.RememberMe);
                // TODO: obviously here instead of hardcoding the country and the city
                // you might want to retrieve them from your backend given the username
                return RedirectToAction("Index", "Home", new { country = "uk", city = "london" });
            }
            else
            {
                ModelState.AddModelError("", "The user name or password provided is incorrect.");
            }
        }

        return View(model);
    }

    public ActionResult LogOff()
    {
        FormsAuthentication.SignOut();
        return RedirectToAction("Index", "Home");
    }
}

and finally you will need to modify the action of the form in ~/Views/Account/LogOn.cshtml to point to the correct controller:

@using (Html.BeginForm("LogOn", "Account")) {
    ...
}

You could leave your routes by default:

public static void RegisterRoutes(RouteCollection routes)
{
    routes.IgnoreRoute("{resource}.axd/{*pathInfo}");

    routes.MapRoute(
        "Default",
        "{controller}/{action}/{id}",
        new { controller = "Home", action = "Index", id = UrlParameter.Optional }
    );
}