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This is quite interesting post. After they install your system again, make sure you ask them to install you a firewall and make sure you disable root login over shell. Create another user and add that user to the wheel group so only once you are logged in with that username over the shell you can su to root. Keep both passwords for these two accounts complex and different!
Also, do not keep your shell on the regular port 22, change that asap to something random like 3755 or such.
If you do not know how, ask support to do it for you. It will take them about 5 minutes for what I just mentioned.
Good luck!
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