MS Echange 2010
Logon screen is fine but when you enter your credentials you receive the message:
ERR_RESPONSE_HEADERS_TRUNCATED
Detailed info says that your pahe has been moved or it is no longer available.
Resolution:
Login to the server where Exchange is installed, open services and check the status of the "Microsoft Exchange Forms Based Authentication service" status, restart it, start it if it is not on. If the service is not started Outlook Web App will not authenticate users.