I'm having a Public Key issue, as stated 2 node clustering w/ Apache Hadoop running

Code:
cat $HOME/.ssh/id_rsa.pub >> $HOME/.ssh/authorized_keys
copy authorized_keys over to PROWL:/home/hduser/.ssh/
ssh localhost - ok
Then

Code:
[hduser@prowl3 ~]$ ssh 'hduser@montanaprowl'
Permission denied (publickey,gssapi-keyex,gssapi-with-mic).
[hduser@prowl ~]$
Code:
/etc/ssh/sshd_config
PasswordAuthentication no
I've chmodded the proper directories for permission using

Code:
chmod go-w ~/
chmod 700 ~/.ssh
chmod 600 ~/.ssh/authorized_keys
To no avail, still having Pubic Key issues, any ideas?

Thanks, Montana!