ERR_TOO_MANY_REDIRECTS

I have a situation, I hope you can help me. I'm having an ERR_TOO_MANY_REDIRECTS error when from the BaseController of an MVC 4.5 application I try to redirect the user who is not logged in to the Login page. It should be mentioned that this page is also configured as a homepage.

Start page code:

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

        routes.MapRoute(
            name: "Default",
            url: "{controller}/{action}/{id}",
            defaults: new { controller = "Cuenta", action = "IniciarSesion", id = UrlParameter.Optional }
        );
    }
}

Code in the base controller that redirects to the login page if it is not authenticated:

public class BaseController : Controller
{
    protected override void OnActionExecuting(ActionExecutingContext filterContext)
    {
        if (!System.Web.HttpContext.Current.User.Identity.IsAuthenticated)
        {
            filterContext.Result = new RedirectToRouteResult(new RouteValueDictionary(new { controller = "Cuenta", action = "IniciarSesion" }));
            return;
        }
        base.OnActionExecuting(filterContext);
    }
}

With this code I am receiving the error mentioned above. If you can help me, I'll be grateful. Greetings.