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I found the solution based on @jasonwryan comment under my question.

There was #AuthorizedKeysFile /usr/NX/home/nx/.ssh/authorized_keys2 in the /etc/ssh/sshd_config sshd config file. Changing the entry to standard AuthorizedKeysFile .ssh/authorized_keys solved the issue.

I found the solution based on jasonwryan's comment under my question.

There was #AuthorizedKeysFile /usr/NX/home/nx/.ssh/authorized_keys2 in the /etc/ssh/sshd_config sshd config file. Changing the entry to standard AuthorizedKeysFile .ssh/authorized_keys solved the issue.

I found the solution based on @jasonwryan comment under my question.

There was #AuthorizedKeysFile /usr/NX/home/nx/.ssh/authorized_keys2 in the /etc/ssh/sshd_config sshd config file. Changing the entry to standard AuthorizedKeysFile .ssh/authorized_keys solved the issue.

I found the solution based on @jasonwryan comment under my question.

There was #AuthorizedKeysFile /usr/NX/home/nx/.ssh/authorized_keys2 in the /etc/ssh/sshd_config sshd config file. Changing the entry to standard AuthorizedKeysFile .ssh/authorized_keys solved the issue.

I found the solution base on @jasonwryan comment under my question.

There was #AuthorizedKeysFile /usr/NX/home/nx/.ssh/authorized_keys2 in the /etc/ssh/sshd_config sshd config file. Changing the entry to standard AuthorizedKeysFile .ssh/authorized_keys solved the issue.

I found the solution based on @jasonwryan comment under my question.

There was #AuthorizedKeysFile /usr/NX/home/nx/.ssh/authorized_keys2 in the /etc/ssh/sshd_config sshd config file. Changing the entry to standard AuthorizedKeysFile .ssh/authorized_keys solved the issue.