Al arranca fail2ban tenemos muchos warnings posiblemente por usar un config antiguo que hay que actualizar:
# service fail2ban start
* Starting authentication failure monitor fail2ban WARNING 'pidfile' not defined in 'Definition'. Using default one: '/var/run/fail2ban/fail2ban.pid'
WARNING 'findtime' not defined in 'ssh'. Using default one: 600
WARNING Wrong value for 'bantime' in 'ssh'. Using default one: '600'
WARNING 'usedns' not defined in 'ssh'. Using default one: 'warn'
WARNING 'findtime' not defined in 'dropbear'. Using default one: 600
WARNING Wrong value for 'bantime' in 'dropbear'. Using default one: '600'
WARNING 'usedns' not defined in 'dropbear'. Using default one: 'warn'
WARNING 'findtime' not defined in 'pam-generic'. Using default one: 600
WARNING Wrong value for 'bantime' in 'pam-generic'. Using default one: '600'
WARNING 'usedns' not defined in 'pam-generic'. Using default one: 'warn'
WARNING 'findtime' not defined in 'xinetd-fail'. Using default one: 600
WARNING Wrong value for 'bantime' in 'xinetd-fail'. Using default one: '600'
WARNING 'usedns' not defined in 'xinetd-fail'. Using default one: 'warn'
WARNING 'findtime' not defined in 'ssh-ddos'. Using default one: 600
WARNING Wrong value for 'bantime' in 'ssh-ddos'. Using default one: '600'
WARNING 'usedns' not defined in 'ssh-ddos'. Using default one: 'warn'
WARNING 'findtime' not defined in 'apache'. Using default one: 600
WARNING Wrong value for 'bantime' in 'apache'. Using default one: '600'
WARNING 'usedns' not defined in 'apache'. Using default one: 'warn'
WARNING 'findtime' not defined in 'apache-multiport'. Using default one: 600
WARNING Wrong value for 'bantime' in 'apache-multiport'. Using default one: '600'
WARNING 'usedns' not defined in 'apache-multiport'. Using default one: 'warn'
WARNING 'findtime' not defined in 'apache-noscript'. Using default one: 600
WARNING Wrong value for 'bantime' in 'apache-noscript'. Using default one: '600'
WARNING 'usedns' not defined in 'apache-noscript'. Using default one: 'warn'
WARNING 'findtime' not defined in 'apache-overflows'. Using default one: 600
WARNING Wrong value for 'bantime' in 'apache-overflows'. Using default one: '600'
WARNING 'usedns' not defined in 'apache-overflows'. Using default one: 'warn'
WARNING 'findtime' not defined in 'vsftpd'. Using default one: 600
WARNING Wrong value for 'bantime' in 'vsftpd'. Using default one: '600'
WARNING 'usedns' not defined in 'vsftpd'. Using default one: 'warn'
WARNING 'findtime' not defined in 'proftpd'. Using default one: 600
WARNING Wrong value for 'bantime' in 'proftpd'. Using default one: '600'
WARNING 'usedns' not defined in 'proftpd'. Using default one: 'warn'
WARNING 'findtime' not defined in 'pure-ftpd'. Using default one: 600
WARNING Wrong value for 'bantime' in 'pure-ftpd'. Using default one: '600'
WARNING 'usedns' not defined in 'pure-ftpd'. Using default one: 'warn'
WARNING 'findtime' not defined in 'wuftpd'. Using default one: 600
WARNING Wrong value for 'bantime' in 'wuftpd'. Using default one: '600'
WARNING 'usedns' not defined in 'wuftpd'. Using default one: 'warn'
WARNING 'findtime' not defined in 'postfix'. Using default one: 600
WARNING Wrong value for 'bantime' in 'postfix'. Using default one: '600'
WARNING 'usedns' not defined in 'postfix'. Using default one: 'warn'
WARNING 'findtime' not defined in 'couriersmtp'. Using default one: 600
WARNING Wrong value for 'bantime' in 'couriersmtp'. Using default one: '600'
WARNING 'usedns' not defined in 'couriersmtp'. Using default one: 'warn'
WARNING 'findtime' not defined in 'courierauth'. Using default one: 600
WARNING Wrong value for 'bantime' in 'courierauth'. Using default one: '600'
WARNING 'usedns' not defined in 'courierauth'. Using default one: 'warn'
WARNING 'findtime' not defined in 'sasl'. Using default one: 600
WARNING Wrong value for 'bantime' in 'sasl'. Using default one: '600'
WARNING 'usedns' not defined in 'sasl'. Using default one: 'warn'
WARNING 'findtime' not defined in 'dovecot'. Using default one: 600
WARNING Wrong value for 'bantime' in 'dovecot'. Using default one: '600'
WARNING 'usedns' not defined in 'dovecot'. Using default one: 'warn'
WARNING 'findtime' not defined in 'named-refused-tcp'. Using default one: 600
WARNING Wrong value for 'bantime' in 'named-refused-tcp'. Using default one: '600'
WARNING 'usedns' not defined in 'named-refused-tcp'. Using default one: 'warn'
WARNING 'findtime' not defined in 'named-refused-udp'. Using default one: 600
WARNING Wrong value for 'bantime' in 'named-refused-udp'. Using default one: '600'
WARNING 'usedns' not defined in 'named-refused-udp'. Using default one: 'warn'
Al arranca fail2ban tenemos muchos warnings posiblemente por usar un config antiguo que hay que actualizar: