Die Autorisierung wurde verweigert für diese Anforderung. Immer

Hab ich schon erstellt eine MVC-webApi-Projekt und jetzt will ich mit Authentifizierung und Autorisierung.
Ich denke, dass ich bereits umgesetzt, dieser Sicherheit aber aus irgendeinem Grund etwas schlecht geht, wenn ich Schreibe, meine Anmeldeinformationen und ich versuche zu nennen, einige webApi Methoden die Meldung "die Autorisierung wurde verweigert für diese Anforderung" angezeigt.

Dies ist der code, den ich umgesetzt habe.

WebApiConfig:

public static void Register(HttpConfiguration config)
    {
        //Web API configuration and services

        //Web API routes
        config.MapHttpAttributeRoutes();

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

        config.Filters.Add(new AuthorizeAttribute());
    }

Routing-Config:

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

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

Controller:

public class RoutingController : Controller
{
    //
    //GET: /Routing/
    public ActionResult Index()
    {
        return View();
    }

    public ActionResult Projects()
    {
        return View();
    }

    public ActionResult Users()
    {
        return View();
    }

    public ActionResult LogIn()
    {
        return View();
    }

    [HttpPost]
    public JsonResult LogInPost(string userName, string password)
    {
        User user = new User();
        RoleByUser rByU = new RoleByUser();
        password = UserController.EncriptPassword(password);
        string url = string.Empty;
        var checkUser = user.Get(userName);
        var userExists = (from userInList in checkUser where userInList.UserName == userName && userInList.Password == password select userInList).FirstOrDefault();
        if(userExists!= null)
        {
            var roles = (from roleByUser in userExists.listOfRole select roleByUser.RoleName.Trim()).ToArray();
            IPrincipal principal = new GenericPrincipal(
            new GenericIdentity(userExists.UserName), roles);
            SetPrincipal(principal);
            url = "Routing/Users";
        }
        return Json(url);
    }

    private void SetPrincipal(IPrincipal principal)
    {
        Thread.CurrentPrincipal = principal;
        if (System.Web.HttpContext.Current != null)
        {
            System.Web.HttpContext.Current.User = principal;
        }
    }

}

HTML:

<link href="~/css/Style.css" rel="stylesheet" type="text/css" />

<div class="container">
    <div class="card card-container">
        <img id="STK" class="profile-img-card" src="Images/Softtek.png" />
        <p id="profile-name" class="profile-name-card"></p>
        <form class="form-signin">
            <span id="reauth-email" class="reauth-email"></span>
            <input type="text" id="txtUserName" class="form-control" placeholder="Email address" required autofocus />
            <input type="password" id="txtPassword" class="form-control" placeholder="Password" required />
            <div id="remember" class="checkbox">
                <label>
                    <input type="checkbox" value="remember-me" /> Remember me
                </label>
            </div>
            @*<button id="btnLogIn" class="btn btn-lg btn-primary btn-block btn-signin"  >Sing In</button>*@
        </form><!-- /form -->
        <button id="btnLogIn" class="btn btn-lg btn-primary">Sing In</button>
        <a href="#" class="forgot-password">
            Forgot the password?
        </a>
    </div><!-- /card-container -->
</div><!-- /container -->

JS:

$(document).bereit(Funktion () {
$('#btnLogIn').klicken Sie auf(logIn); });

function logIn() {
    $.ajax({
        type: "POST",
        url: "http://localhost:21294/Routing/LogInPost",
        dataType: "json",
        data: { userName: $('#txtUserName').val(), password: $('#txtPassword').val() },
        success: function (data) {
            if(data!= "" && data!= undefined && data!= null)
                window.location.href = data;
        },
        error: function (err, e, error) {
            toastr.error('Error')
        }
    });