when i login, i get (firefox) Redirect Loop Error, Redirection limit for this URL exceeded. Unable to load the requested page. This may be caused by cookies that are blocked.

The browser has stopped a connection because the site is redirecting requests to itself in a manner which prevents it from ever completing.

with IE, it loads page for a long time, until that blue progress bar hits top, and it simpy stops. IMAP and other clients (thunederbird, outlook) work ok, it's just web interface.