Blackberry support for Forms Authentication - ASP.NET MVC app

I'm writing an ASP.NET MVC application that uses Forms Authentication. The target clients are a variety of mobile web browsers.

When I use t开发者_如何学JAVAhe BlackBerry 8530 simulator my MVC app authenticates as expected. I can visit pages whose controller methods are decorated with the [Authorize] attribute - no problem - they display and therefore I assume my Forms Authentication is working correctly.

Using a physical Windows Mobile device to browse my site, I have the same experience as the BB simulator, the forms authentication works as I would expect.

BUT when I try to visit the site using a Blackberry 8900 physical device the Login page keeps on looping back when I click the Login page. The device is not retaining it's "authenticated" status.

I added code to verify this and I can see that: Request.IsAuthenticated: False User.Identity.IsAuthenticated: False

So my question is what next steps can I take to try and find out why the Blackberry 8900 is losing it's authentication status. Is this cookie related?

Anyone have any ideas?

Cheers Derek

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In your web.config, try to put cookieless="true" in the sessionState tag