ASP.NET MVC身份验证Cookie未被检索

>显示在控制器操作中设置并放置在ViewData中以供视图读取的Request.Cookies的结果.请注意,它缺少.ASPXAUTH cookie
>显示Chrome开发人员工具的结果.你可以看到.ASPXAUTH包含在这里.

alt text http://i50.tinypic.com/ibctjd.png

这可能是什么问题？为什么ASP.NET不从cookie集合中读取此值？

我的应用程序使用自定义IPrincipal. BusinessPrincipalBase是一个CSLA对象,它实现了IPrincipal.这是代码：

[Serializable()]
public class MoralePrincipal : BusinessPrincipalBase
{
    private User _user;

    public User User
    {
        get
        {
            return _user;
        }
    }

    private MoralePrincipal(IIdentity identity) : base(identity)
    {
        if (identity is User)
        {
            _user = (User)identity;
        }
    }

    public override bool Equals(object obj)
    {
        MoralePrincipal principal = obj as MoralePrincipal;
        if (principal != null)
        {
            if (principal.Identity is User && this.Identity is User)
            {
                return ((User)principal.Identity).Equals(((User)this.Identity));
            }
        }
        return base.Equals(obj);
    }

    public override int GetHashCode()
    {
        return base.GetHashCode();
    }

    public static bool Login(string username,string password)
    {
        User identity = User.Fetch(username,password);
        if (identity == null || !identity.IsAuthenticated)
        {
            identity = (User)User.UnauthenicatedIdentity;
        }

        MoralePrincipal principal = new MoralePrincipal(identity);
        Csla.ApplicationContext.User = principal;
        Context.Current.User = identity;

        return identity != null && identity.IsAuthenticated;
    }

    public static void Logout()
    {
        IIdentity identity = User.UnauthenicatedIdentity;
        MoralePrincipal principal = new MoralePrincipal(identity);
        ApplicationContext.User = principal;
        Context.Current.User = identity as User;
    }

    public override bool IsInRole(string role)
    {
        if (Context.Current.User == null || Context.Current.Project == null)
        {
            return false;
        }

        string userRole = Context.Current.User.GetRole(Context.Current.Project.Id);
        return string.Compare(role,userRole,true) == 0;
    }

该应用程序还使用自定义成员资格提供程这是代码.

public class MoraleMembershipProvider : MembershipProvider
{
    public override bool ValidateUser(string username,string password)
    {
        bool result = MoralePrincipal.Login(username,password);
        HttpContext.Current.Session["CslaPrincipal"] = ApplicationContext.User;
        return result;
    }

    #region Non-Implemented Properties/Methods

    public override string ApplicationName
    {
        get
        {
            return "Morale";
        }
        set
        {
            throw new NotImplementedException();
        }
    }

    // Everything else just throws a NotImplementedException

    #endregion
}

我不认为这是任何相关的,因为底线是Request.Cookies不返回身份验证cookie.它与cookie的大小有关吗？我听说cookie有大小问题.

更新：问题似乎围绕子域.此站点使用子域托管,cookie域保留为空.有没有人对如何让auth cookie与所有域(例如http://example.com,http://www.example.com和http://sub.example.com)一起使用有任何指示？