1. Connect to the server and check ssh properties:
sudo nano /etc/ssh/sshd_config
# Change to no to disable tunnelled clear text passwords PasswordAuthentication yes
PasswordAuthentication should be set to yes.
2. Now restart ssh service:
service ssh restart
3. Try to make ssh connection with authentication by password:
There you can find how to create new user, if you don’t have one, for your ssh connection.