title: Page not showing login window on enter
body: <p>Hello I have webpage which uses Windows authentication. 
  It is working well in</p>
  
  <ul>
  <li>IE</li>
  <li>Chrome</li>
  <li>Opera</li>
  </ul>
  
  <p>and not working in</p>
  
  <ul>
  <li>Firefox</li>
  </ul>
  
  <p>In Firefox and opera when I try enter my page modal window appears asking for windows login and password. When I input them I can browse my page. In Chrome and IE I don't need to do anything.
  For me its strange. </p>
  
  <p>Controller:</p>
  
  <pre><code>using System;
  using System.Collections.Generic;
  using System.Data;
  using System.Data.Entity;
  using System.Linq;
  using System.Net;
  using System.Web;
  using System.Web.Mvc;
  using magazyn.Models;
  using magazyn.Autorization;
  using System.Text;
  namespace magazyn.Controllers
  {
      public class HomeController : Controller
      {
          private EquipmentEntities db = new EquipmentEntities();
          [AllowAnonymous]
          public ActionResult Index()
          {
              return View();
          }
          public ActionResult About()
          {
              ViewBag.Message = "Your application description page.";
          return View();
      }
  
      public ActionResult Error401()
      {
          return View();
      }
  
  }
  }
  </code></pre>
  
  <p>As You can see ther is <code>[AllowAnonymous]</code> attribute so why Firefox and Opera demands login and password to enter the page?</p>
  
  <p>@Update:
  I check IIS config. Anonous Authentication is enabled.</p>