QuickFix: Authentication refused: bad ownership or modes for file /root/.ssh/authorized_keys

Just set the correct ownership and permissions

#chown root /root/.ssh && chmod 700 /root/.ssh
#chown root /root/.ssh/authorized_keys && chmod 600 /root/.ssh/authorized_keys

Error in log: Debian auth.log prints these lines:

Authentication refused: bad ownership or modes for file /root/.ssh/authorized_keys