Have you installed CSF in your server?
There is a daemon called lfd bundled with csf.
Login Failure Daemon (lfd) is a process that runs all the time and periodically (every X seconds) scans the latest log file entries for login attempts against your server that continually fail within a short period of time. Such attempts are often called "Brute-force attacks" and the daemon process responds very quickly to such patterns and blocks offending IP's quickly.
There is a daemon called lfd bundled with csf.
Login Failure Daemon (lfd) is a process that runs all the time and periodically (every X seconds) scans the latest log file entries for login attempts against your server that continually fail within a short period of time. Such attempts are often called "Brute-force attacks" and the daemon process responds very quickly to such patterns and blocks offending IP's quickly.
To check why lfd has failed look at the end of /var/log/lfd.log
Support for csf+lfd is over here - http://forum.configserver.com
Support for csf+lfd is over here - http://forum.configserver.com
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