By default Solaris 10 will not give you access to root access unless you don’t do modification as per below recommendations:
At first check out the ssh configuration file and find out what is the value for PermitRootLogin in this file and make it yes if its no.
Restart the ssh service by below command:
Now just check it, you will be able to connect to root, unless there is no extra security at firewall level.
Hope it helps…