Ubuntu – permission denied for root@localhost for ssh connection

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I just installed Ubuntu 14.04 and LAMP on that. Then, I wanted to configure my server, so tried out This tutorial.

When I give the command:

ssh root@localhost

I get : Permission denied, please try again.
I have logged in as root user through the command :

sudo -i

I also tried the same, by logging in through:

sudo -s

I use the same password as that I used to log in as user, but still am getting the same error message.

Could someone help me out here?

PS: I looked into This question but didn't seem to work for me.

Best Answer

By default, the SSH server denies password-based login for root. In /etc/ssh/sshd_config, if the following line exists, possibly commented out (with a # in front):

PermitRootLogin without-password

Then change it to the following, uncommenting if needed (remove the # in front):

PermitRootLogin yes

And restart SSH:

sudo service ssh restart

Or, you can use SSH keys. If you don't have one, create one using ssh-keygen (stick to the default for the key, and skip the password if you feel like it). Then do sudo -s (or whatever your preferred method of becoming root is), and add an SSH key to /root/.ssh/authorized_keys:

cat /home/user/.ssh/id_rsa.pub >> /root/.ssh/authorized_keys