Unable to login without password
 

Hi,

I am prompted for password even though I have copied id_rsa.pub key from the local machine to authorized_keys in the remote machine.

I have created the public key using ssh-keygen -t rsa on the local machine

Lots more factor leads to failure of ssh passwordless login ,First make sure you had set proper permission for your keys & .ssh file.
Have you enable PubkeyAuthentication yes in your sshd_config file .

Look after the blog for configuration of ssh passwordless login

http://www.linuxquestions.org/questi...os-rhel-35029/

That is a big post man. I restarted both machines and it fixed the issue. do not know what was causing the problem. Any log file we can check to proceed with digging into the problem?

Well, ssh normally logs to /var/log/secure.
You could also look at /var/log/mesages.
Remember the logs may have been rotated.