The demo film suggests the login “frontrow” for connecting the ATV to Cyberduck. The response is “530 login incorrect”.
As mountain lion no longer supports Front Row this wasn’t too surprising. But what login should now be used
frontrow login and frontrow password is still working for me if that helps
for ssh access using CyberDuck, the login is root, the password is alpine.
You can also access from Terminal by typing
ssh root@youripaddress
then enter password alpine