What am I missing? I change the root password on a unix machine, then try to log in with that password. PasswordAuthentication is set to yes in sshd_config and the sshd daemon has been restarted. This behavior happens whether I log in remotely or locally:

root@ip-10-0-0-155:~# passwd
Enter new UNIX password: 
Retype new UNIX password: 
passwd: password updated successfully
root@ip-10-0-0-155:~# ssh root@
root@'s password: 
Permission denied, please try again.
root@'s password:

migrated from stackoverflow.com Aug 18 '12 at 11:02

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  • 2
    Some systems do not allow root login have to verified that? – Rohan Aug 18 '12 at 6:41
  • make sure of your ip's which you have changed the password and trying to re-login are the same ip's. – THANGA Aug 18 '12 at 6:44
  • 1
    Check root login permission: grep -i permitroot /etc/sshd_config. – Vidul Aug 18 '12 at 6:49
  • This is not necessarily a good idea... – Alex Chamberlain Aug 18 '12 at 18:11
  • Perhaps someone can clarify this: I found that a password that contained a @ always failed (for three different clean installs) but an identical password that used a ! instead worked OK – ElectricLlama Nov 8 '17 at 0:03

Check this file: /etc/ssh/sshd_config and search for the line:

PermitRootLogin no

replace it by:

PermitRootLogin yes
  • Tough if you can't log in as root - having the same problem – Bysander Jul 1 '15 at 8:52
  • 1
    This is the solution, but security wise, there are probably some better options.. – Ring Ø Oct 1 '15 at 15:45

I had the same problem and I solved it.

My keyboards were not configured in the same manner between an ssh console and the server's keyboard. The key + on my numpad was, in fact, the =; but I never find out why.

Check if you enter the same characteres.


You are logging in to localhost with ssh. This is usually not necessary and may carry some overhead. Try

su -

in a terminal and enter the password.

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