I installed the SLiM login manager on Debian Wheezy and disabled the root account's ability to login, as described in this Debian Wiki article, so
sudo <command> must be used to run anything as root.
When I try to shutdown the system from SLiM, by following the instructions in the SLiM manual, i.e. typing "halt" as the username, then a password, SLiM does not shutdown.
/var/logs/slim.logs reports this error:
slim: pam_authentication(): Authentication failure
- This problem does not appear when Debian is configured to allow root to login.
How can I shutdown the computer from SLiM when root login is disabled?