I have an AS5400 configured and allowing users to dial in. When the Windows dial up client has the "show terminal window" selected, we cannot log in. It prompts for a user name and password, however it will not accept it. If we unselect this feature, we can type in a username and password before we connect and once connected, it will let us in. We have a few hundred users and to walk them all through to unselect the "show terminal window" and train them on how to use it this way will take too long.
I have this problem too.