Overview
#apt-get install openssh-server
#apt-get install ssh
#/etc/init.d/ssh start|stop|restart
The configuration /etc/ssh/sshd_config
How to allow root ssh login
#vi /etc/ssh/sshd_config
# Authentication:
LoginGraceTime 120
PermitRootLogin without-password
StrictModes yes
Change
PermitRootLogin without-password
PermitRootLogin yes