Some useful notes to secure a public available server.
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Use Fail2ban

Installation

apt install fail2ban

Configuration

Add the following to /etc/fail2ban/jail.d/defaults-debian.local:

[DEFAULT]
# in seconds
bantime = 3600
maxretry = 3
backend  = auto

[sshd]
enabled = true
filter  = sshd
backend = systemd

Apply Changes

Run service fail2ban restart to activate the changes.