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I have a system set up with an administrator account aside from root.
I've lost the ability to su to that administrator account, even from root. It was working fine a week ago.
When I log in as root, I get the following:
[root@localhost root]# su admin
su: incorrect password
I can su to any other account just fine.
[root@localhost root]# su user
I've tried changing the root password and admin password, but nothing has helped. I've removed the admin entries from /etc/passwd and /etc/shadow and tried, and system says the account doesn't exist, which is expected. However, when I add them back, same problem.
Not sure if this matters or not, but the admin account password was set to expire after 60 days. I've checked the config files the account is not locked.