Allow/Disallow Root SSH Login
From KlavoWiki
Edit Config File
vi /etc/ssh/sshd_config
Allow
To allow root login from SSH add the line
PermitRootLogin Yes
Disallow
To disallow root login remove the above line or change it to
PermitRootLogin No
or
PermitRootLogin without-password
Restart daemon
Then restart the SSH daemon
systemctl restart ssh