Originally posted by: lech77
Please check access permissions for all the elements of the full
 path to authorized_keys file. Make sure that none of the elements
 is writable to anyone else than its owner. Group writable $HOME
 or /home (or any element of the path) will get you into trouble.
 You can also try to run the sshd in debug mode (-ddd), listening
 on a non-standard port (-p xxxx), attempt to log in using the
 public key authentcation and take a good look at the sshd output.
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