12-19-2010 03:11 PM
I would expect that the default root password was changed after first login of the admin. In general you would get a prompt to change admin, root and user password.
Auto login is possible as admin. Check admin guide 6.4.x section
"SSH public key authentication"
12-21-2010 03:05 AM
As Andreas suggests, you can set up a key exchange with the admin user (depending on your FOS release) - this is much better than using root.
Have a look at the sshutil command - it's quite simple to setup