How to ban an ipaddress from accessing your server.
Here is how you ban an IP from accessing your server.

1) Login to the server as and su  - to root.

2) If you are running iptables, you can enter:

iptables -A INPUT -s <IP> -j DROP

3) If you have APF firewall installed

apf -d <ip>

4) When you reboot this IP ban will be removed, meaning the IP will no longer be banned anymore.
If you have APF you can get around this by opening the deny hosts file.

pico /etc/apf/deny_hosts.rules

Scroll to the bottom and paste in the IP address.
Ctrl+X then Y to save the changes and exit.

5) Restart APF
/etc/apf/apf -r

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