Change /etc/ssh/sshd_config:

root@localhost:/etc/ssh# diff sshd_config.org sshd_config
27c27
< PermitRootLogin yes
---
> PermitRootLogin no
51a52
> PasswordAuthentication no
87c88,93
< UsePAM yes
---
> UsePAM no
>
> # Blue Light changes to improve performance
> UseDNS no
> GSSAPIAuthentication no
> Compression yes