Hi, I've configured fail2ban with action, filter for my php application. My app output log like this: unknown user foo (192.x.x.x) My jail conf: [php-app-login] enabled = true port = 80 protocol = tcp filter = php-app-login logpath = /var/www/php-app-login/var/logs/dev.log findtime = 3600 bantime = 86400 maxretry = 3 ignoreip = 127.0.0.1/8 My filter definition: [Definition] failregex = unknown user .* \(<HOST>\) ignoreregex = It works well, but I like fail2ban add comment in iptables rule when add ban IP. For example: iptables -A INPUT -p tcp --dport 80 -m comment --comment "Ban foo" -j DROP iptables -L -n -v Chain INPUT (policy ACCEPT 94 packets, 23457 bytes) pkts bytes target prot opt in out source destination 0 0 DROP tcp -- * * 0.0.0.0/0 0.0.0.0/0 tcp dpt:80 /* Ban foo */ I've googled and I think something needs to be changed in action but I can't find how to pass the user variable to that action.