How can I modify my
sshd_config so that it blocks access to all users except the root user?
I've had a look and I tried
AllowUsers root DenyUsers *
But that doesn't do anything
I tried this myself, adding only the
If you're using Linux, you can use the pam_succeed_if.so PAM module (if your distro has it). Other OSes may or may not have it so YMMV.
You can also allow specific groups, or numerical uids/gids, etc.
See http://linux.die.net/man/8/pam_succeed_if for more information on this PAM Module.