You've set up your new Red Hat Enterprise Linux 6 box and you can ssh in using passwords with no problem.
But now you want to stop using passwords and start using keys. So you install your keys:
scp .ssh/id_dsa.pub me@example.com:.ssh/authorized_keys
But the system keeps prompting you for a password! The keys don't seem to work at all.
That might be because SELinux is preventing it because the proper attributes are not on the authorized_keys file. Or possibly you have permissions wrong on your .ssh directory. The solution:
cd /home/me
chmod go-rwx .ssh
restorecon -R -v /path/to/.ssh
Restorecon will respond with
restorecon reset /home/me/.ssh context unconfined_u:object_r:user_home_t:s0->unconfined_u:object_r:ssh_home_t:s0
restorecon reset /home/me/.ssh/authorized_keys context unconfined_u:object_r:user_home_t:s0->unconfined_u:object_r:ssh_home_t:s0
It's always SELinux, isn't it?
Reference: RHEL6 SSH key