Enable root login over SSH

By default, FreeBSD box doesn’t allow root user login over SSH, to enable it, you need to modify SSH daemon configuration file (/etc/ssh/sshd_config).

Change the following line: 

  1. #PermitRootLogin no

to: 

  1. PermitRootLogin yes

Then restart SSH daemon: 

  1. # /etc/rc.d/sshd restart

Reference:
How to enable root login over SSH on FreeBSD 8.2.