How to block an IP address with UFW (uncomplicated firewall)

Recipe

$ sudo ufw insert 1 deny from [ip-to-block] to any

The 1 above shows the order of the insert.

You can insert a rule without an order numeric:
$ sudo ufw deny from [ip-to-block]

If you’ve already inserted a rule and it doesn’t work, check the order as per the sequence below:

Show all rules

$ sudo ufw status numbered

Delete Rule

First Show all rules

$ sudo ufw delete 19

Reference

https://serverfault.com/questions/484475/ufw-firewall-rules-ordering

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