Has user got the correct username and password?
Still not working?
Confirm and retype username and password.
Still not working?
Make a new dialer.
Still not working?
Rename pwl files on the machine (make sure you have all your passwords) and log back onto windows.
Still not working?
Re-install Dial up Networking.
Still not working?
Drop the modem speed to 19200, remove error control add AT&F1 to extra settings remove software compression from dialer.
Still not working?
Extract rasapi32.dll.
Still not working?
Try via hyperterminal.
Still not working?
RTV.