I'm able to SSH to my server (CentOS 5.9) using an admin account with sudo privileges:
$ ssh admin@myserver Last login: Wed Feb 27 19:23:11 2013 from [IP ADDRESS] [admin@myserver ~]$
Then I can su to root:
[admin@myserver ~]$ sudo su root [sudo] password for admin: [root@myserver admin]#
But I can't su to another user, and the su command is not telling me why:
[admin@myserver ~]$ sudo su anotheruser [admin@myserver ~]$ whoami admin
Any idea why I can su to root, but not to other users?
How can I get su to tell me why it is not doing what I want it to do?