5. Reload the Jails
It should be this simple:
fail2ban-client reload
root@example:~# fail2ban-client reload OK root@example:~#
However, you might get an error. For example:
root@example:~# fail2ban-client reload 2023-05-30 03:32:57,425 fail2ban [1743]: ERROR Could not find server root@example:~#
This usually means fail2ban isn’t running (although there are lots of other errors you can get too), so the first thing to try is starting fail2ban.