Where is option to "enable the current firewall management" in current web UIYour server still uses parts of the old firewall/fail2ban system. Support for the old firewall management was dropped with KeyHelp 21.1.
To keep your fail2ban configuration compatible with upcoming KeyHelp updates, either enable the current firewall management introduced with KeyHelp 20.3 or remove the following configuration directives from the top of the file /etc/fail2ban/jail.d/keyhelp.local and add them back in another appropriate fail2ban configuration file. Restart the fail2ban service afterwards.
or alternatively which fail2ban configuration file is appropriate for Ubuntu 18.04?