The My Exede web page is a secure connection, one that requires valid security certificates in your computer. You may have good certs, but they are timely, meaning your system clock must be set somewhat correctly. If it is off by a few weeks or years even, the certificates appear invalid and you cannot access the page. Check your computer system clock. If all ok, send an email to firstname.lastname@example.org with your account and contact information explaining your problem.