Open '/etc/ssh/sshd_config' and set the following parameters:
ChallengeResponseAuthentication yes
PasswordAuthentication yes
UseDNS no
PermitRootLogin yes
Save
Open '/etc/ssh/sshd_config' and set the following parameters:
ChallengeResponseAuthentication yes
PasswordAuthentication yes
UseDNS no
PermitRootLogin yes
Save