When Solaris 10 or 11 is installed, by default root can not login from remote machine but normal users can login and can choose to switch to admin using su or sudo.
Root users remote access is disabled on the SSH daemon SSHD level, so simple modify sshd_config file located in /etc/ssh/sshd_config
Locate a line with PermitRootLogin no and replace it with PermitRootLogin yes
Then restart SSHD by the command below
#svcadm restart svc:/network/ssh:default
Now: you can access Solaris system with root account remotely
