IsAuthenticated works on browser - but not with Air client!

My login code, after authentication:

var authTicket = new FormsAuthenticationTicket(
                1,
                userName,
                DateTime.Now,
                DateTime.Now.AddMinutes(20), // expiry
                false,
                roles,
                "/");
var cookie = new HttpCookie(FormsAuthentication.FormsCookieName, FormsAuthentication.Encrypt(authTicket));
Response.Cookies.Add(cookie);

and, thanks to Darin Dimitrov, I have a custom Authorize attribute:

[AttributeUsage(AttributeTargets.Method | AttributeTargets.Class, Inherited = true, AllowMultiple = true)]
public class TJAuthorize : AuthorizeAttribute {
    public override void OnAuthorization(AuthorizationContext filterContext) {
        string cookieName = FormsAuthentication.FormsCookieName;

        if (!filterContext.HttpContext.User.Identity.IsAuthenticated ||
                filterContext.HttpContext.Request.Cookies == null || filterContext.HttpContext.Request.Cookies[cookieName] == null) {
                    HandleUnauthorizedRequest(filterContext);
            return;
        }

        var authCookie = filterContext.HttpContext.Request.Cookies[cookieName];
        var authTicket = FormsAuthentication.Decrypt(authCookie.Value);
        string[] roles = authTicket.UserData.Split(',');

        var userIdentity = new GenericIdentity(authTicket.Name);
        var userPrincipal = new GenericPrincipal(userIdentity, roles);

        filterContext.HttpContext.User = userPrincipal;
        base.OnAuthorization(filterContext);
    }

This all works beautifully when I'm working in a browser session. But now I am working with a Flash/Adobe Air client, and the authentication attribute is causing a failure. By putting debug statements into the code, I can tell that:

filterContext.HttpContext.User.Identity.IsAuthenticated

is false - even after a successful login!

Why should there be any difference between using a browser client and an Air client? And how do I fix this?

EDIT: Another clue: after putting in some more debug statements, I have found that the filterContext.HttpContex开发者_StackOverflow中文版t.User.Identity is not correctly set when making the call from Air - the Name property comes out blank! Session ID is correct, cookie ID is correct - but the User.Identity is not set. Any ideas why this might be happening?

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Perhaps HttpCookieMode (http://msdn.microsoft.com/en-us/library/system.web.httpcookiemode.aspx) is set to the wrong value?

Default is UseDeviceProfile ... what happens when you force it to UseCookies ?

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It's a longshot, but IsAuthenticated depends on client's ASPXAUTH cookie (or whatever you've named id) being sent with request. Make sure that flash/air is sending that cookie (by wireshark or any other network tool)

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Does the HttpContext.User.Identity show up in the Application_AuthorizeRequest in global.asax?