SSH access to root user in Linux

SSH access to root user in Linux
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Edit the /etc/ssh/sshd_config file
Change PermitRootLogin, PasswordAuthentication, ChallengeResponseAuthentication to yes and AuthorizedKeysFile     /root/.ssh/authorized_keys.
then restart ssh daemon
/etc/init.d/sshd restart
chkconfig sshd on

[root@instance-1centos67 yogeshanuvadia]# egrep -i "PermitRootLogin|PasswordAuthentication|ChallengeResponseAuthentication" /etc/ssh/sshd_config
PermitRootLogin yes
PasswordAuthentication yes
ChallengeResponseAuthentication yes
AuthorizedKeysFile     /root/.ssh/authorized_keys