The way it used to work at my end is that you store GUEST GUEST as login/pass in the modem and make a new connection in the desktop and use it to connect but now its giving me ERROR 678 when i do it this way but if i store it in my modem then works fine which isn't quite fine for me because i am not having night UL plan and while i keep the pc to shutdown automatically before 8am my modem still stays connected whereas if by the first way that is by making a connection on desktop, when the pc shuts down the connection is dropped.

Any suggestions?