Asp.net mvc 4 这是mvc4中关于跨域身份验证的错误吗？

我在mvc3和.net4上使用了跨域cookie身份验证，它运行良好， 我在mvc4和.net 4.5上创建了另一个项目，并在mvc上将代码从较低版本复制到较高版本，我的意思是mvc4，现在我在主域上创建了身份验证cookie，但子域无法意识到用户已通过身份验证

这是mvc4中的一个bug还是我必须启用一些未来或类似的东西

在主域上创建身份验证cookie的我的代码：

        FormsAuthenticationTicket ticket = new FormsAuthenticationTicket(
          1,
           "fc5f06b006b44b05a257c406f4218638",//username
           DateTime.Now,
           DateTime.Now.AddDays(5),
           true,
           "members",
           FormsAuthentication.FormsCookiePath);

        // To give more security it is suggested to hash it
        string hashCookies = FormsAuthentication.Encrypt(ticket);
        HttpCookie cookie = new HttpCookie(FormsAuthentication.FormsCookieName,
                                            hashCookies); // Hashed ticket
        cookie.Expires = DateTime.Now.AddDays(5);
        cookie.Domain = ".maindomain.com";
        Response.Cookies.Add(cookie);

在子域中，使用此行代码测试用户身份验证：

var result = System.Web.HttpContext.Current.User.Identity.IsAuthenticated + "-" +
                 System.Web.HttpContext.Current.User.Identity.Name;

在我的全球计划中，我有：

   protected void Application_AuthenticateRequest(object sender, EventArgs e)
    {
        // look if any security information exists for this request
        if (System.Web.HttpContext.Current.User != null)
        {
            // see if this user is authenticated, any authenticated cookie (ticket) exists for this user
            if (HttpContext.Current.User.Identity.IsAuthenticated)
            {
                // see if the authentication is done using FormsAuthentication
                if (System.Web.HttpContext.Current.User.Identity is FormsIdentity)
                {
                    // Get the roles stored for this request from the ticket
                    // get the identity of the user
                    FormsIdentity identity = (FormsIdentity)System.Web.HttpContext.Current.User.Identity;
                    // get the forms authetication ticket of the user
                    FormsAuthenticationTicket ticket = identity.Ticket;
                    // get the roles stored as UserData into the ticket 
                    string[] roles = ticket.UserData.Split(',');
                    // create generic principal and assign it to the current request
                    System.Web.HttpContext.Current.User = new System.Security.Principal.GenericPrincipal(identity, roles);
                }
            }
        }
    }

在我的web配置中：

  <authentication mode="Forms">
     <forms domain=".maindomain.com" name="atnc"  
      loginUrl="~/home" timeout="120" requireSSL="false" />
  </authentication>

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如果它真的是一个bug，那么你可能会更幸运地将它发布到