To perform this you need to access the terminal physically or via telnet. And obviously you have to be a root user.
From terminal, use a text editor like vi to open the configuration file of SSH
# vi /etc/ssh/sshd_config
Now look for following line in the file:
You need to replace the ‘no’ with ‘yes’ to enable SSH.
Save the file and exit.
Restart the SSH service with the following command:
# svcadm restart network/ssh
That’s it, you’re done.