On Mon, Sep 27, 2010 at 10:22 PM, T o n g <mlist4suntong@yahoo.com> wrote: > On Mon, 27 Sep 2010 22:16:34 -0400, Tom H wrote: > >> Do you have the "!root_sudo" option set? > > Nope: > > $ sudo cat /etc/sudoers | grep root_sudo || echo no > no > > Thank you all the same. You're welcome. Do you have an "/etc/pam.d/sudo" file? Can another user use sudo? Any hint about the reason for the failure in "/var/log/auth.log"?