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U better try this https://kb.mediatemple.net/questions/1626/Using+SSH+keys+on+your+server

is it working?

uncomment this line #AuthorizedKeysFile %h/.ssh/authorized_keys in sshd_config. Now restart service and try again.

do you have permission for generated key file?

any luck with below commands???

ssh -o PreferredAuthentications=keyboard-interactive -o PubkeyAuthentication=no host.example.com
and
ssh -o PreferredAuthentications=password -o...

post your vps sshd_config configuration and -vvv verbose output of ur attempt.
also try,
ssh -o PreferredAuthentications=keyboard-interactive -o PubkeyAuthentication=no host.example.com
and
ssh...

Check for: "PasswordAuthentication yes" on vps ssh configuration.

OR

you can use public key if you do not want to put in a password everytime.

On your server

Code:
sudo...

All you have to do is restart bind to clear its cache:

# /etc/init.d/named restart

You can also use rndc command as follows flush out all cache:

# rndc restart

OR

chk for updates or try reinstalling webmin for quick fix...!!!

You could add a line to /etc/rc.local like :

iptables-restore < /path/to/iptables/save-file

The location of the same file depends on your Linux distro - it might
be at /etc/sysconfig/iptables...