Increase security defenses against brute-force attacks #61
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With #58 and #60 exposing services like SSH and RDP on standard ports, it's important that we step up our security to prevent brute-force attacks. Maybe something like Fail2ban would be a good idea.
This has a lot of good suggestions: https://security.stackexchange.com/questions/110706/am-i-experiencing-a-brute-force-attack
The default OpenSSH configuration is actually already pretty resistant to brute-force attacks. No accounts except for the normal user accounts have login shells, and root login requires a public key, so our setup should be quite secure.