followed the guide posted below http://www.howtoforge.com/perfect-server-centos-5.5-x86_64-ispconfig-3 centos 5.5, 64bit, ispconfig 18.104.22.168 i've installed fail2ban, it's running, but does not appear to be doing anything. contents of fail2ban.log are empty. ispconfig tells me "fail2ban is not installed at this server." i believe the problem is that the fail2ban binary is not in my path. here is the output of some which commands Code: which fail2ban /usr/bin/which: no fail2ban in (/usr/kerberos/sbin:/usr/kerberos/bin:/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/root/bin) which fail2ban-server /usr/bin/fail2ban-server which fail2ban-client /usr/bin/fail2ban-client my problem is i have no idea what the fail2ban binary is, or where it's located. any help would be greatly appreciated.