Hi,
Have you setup the root password first?
The process should like this:
1.Setup root password
$ sudo passwd root
2.Edit /etc/ssh/sshd_config
diff --git a/sshd_config b/sshd_config
index a32dc1d..d21cacd 100644
--- a/sshd_config
+++ b/sshd_config
@@ -30,6 +30,7 @@
#LoginGraceTime 2m
#PermitRootLogin prohibit-password
+PermitRootLogin yes
#StrictModes yes
#MaxAuthTries 6
#MaxSessions 10
@@ -54,7 +55,7 @@
# To disable tunneled clear text passwords, change to no here!
#PasswordAuthentication yes
-#PermitEmptyPasswords no
+PermitEmptyPasswords no
# Change to yes to enable challenge-response passwords (beware issues with
# some PAM modules and threads)
3. Roboot
$ sudo reboot
Thanks.