Root user unable to login from putty

Hi Friends,

I have enabled ssh configuration file to PermitRootLogin yes, then restart the sshd services but still unable to login from putty.
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Secure logs :

Sep 28 01:49:07 localhost unix_chkpwd[4321]: password check failed for user (root)
Sep 28 01:49:07 localhost sshd[4319]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=192.168.253.1 user=root
Sep 28 01:49:07 localhost sshd[4319]: pam_succeed_if(sshd:auth): requirement "uid >= 1000" not met by user "root"
Sep 28 01:49:09 localhost sshd[4319]: Failed password for root from 192.168.253.1 port 49803 ssh2
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Also iptables, firewall and selinux disabled.

POINT : I am providing the correct password only also done restart of machine.

Please check and let us know