SSH login as root fails, but I'm sure I entered the right password

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http://unix.stackexchange.com – What am I missing? I change the root password on a unix machine, then try to log in with that password. PasswordAuthentication is set to yes in sshd_config and the sshd daemon has been restarted. This behavior happens whether I log in remotely or locally: root@ip-10-0-0-155:~# passwd Enter new UNIX password: Retype new UNIX password: passwd: password updated successfully root@ip-10-0-0-155:~# ssh [email protected] [email protected]'s password: Permission denied, please try again. [email protected]'s password: (HowTos)