I have a remote host, previously I can ssh into it with root and password
or I ssh into it first using a regular user account
su root and input password
but today, in both ways, my password is always incorrect, like
[esolve@local esolve]$ ssh root@remote_host root@remote_host's password: Permission denied, please try again.
[esolve@remote_host ~]$ su root Password: su: incorrect password
I can use this password to log in with root if I operated locally on that remote machine today.
I ssh into is via VPN
Why did this happen? How can I solve this problem?