I haven't migrated to Solaris 9, but in Solaris 8 root access is limited by /etc/default/login. There is a parameter:
CONSOLE=/dev/console
That allows root initial login to the system only from that device -- in this case, the console. If you comment out that line by placing a '#' in front of it and sae the file, root can log in from across the network.
#CONSOLE=/dev/console
This is not usually a good idea but the ramifications are far beyond the scope of this reply. Good luck.