On Mac OS, in order to allow ssh using dsa keys, I would copy ~/.ssh/id_dsa.pub from my machine into ~/.ssh/authorized_keys of the target machine. I've created .ssh directories in my account home as well as in /root and copied the respective keys to authorized_keys files in each. Strangely, I can now ssh as root with no password but my own user account still prompts for a password. What might be wrong? Interestingly, passwordless root ssh log-in worked while 'PermitRootLogin' in /etc/ssh/sshd_config was just 'yes' and before I changed it to 'without-password'.