NAME

       fail2ban  -  a  set  of  server  and  client  programs to limit brute force authentication
       attempts.

DESCRIPTION

       Fail2Ban consists of a client,  server  and  configuration  files  to  limit  brute  force
       authentication attempts.

       The  server  program  fail2ban-server  is responsible for monitoring log files and issuing
       ban/unban commands.  It gets configured through  a  simple  protocol  by  fail2ban-client,
       which  can also read configuration files and issue corresponding configuration commands to
       the server.

       For details on the configuration of fail2ban see the jail.conf(5) manual page.  A jail (as
       specified  in  jail.conf)  couples  filters  and actions definitions for any given list of
       files to get monitored.

       For details on the command-line options  of  fail2ban-server  see  the  fail2ban-server(1)
       manual page.

       For  details  on  the  command-line  options  and  commands for configuring the server via
       fail2ban-client see the fail2ban-client(1) manual page.

       For testing regular expressions specified in a filter using the fail2ban-regex program may
       be of use and its manual page is fail2ban-regex(1).

LIMITATION

       Fail2Ban  is  able  to  reduce  the  rate of incorrect authentications attempts however it
       cannot eliminate the risk that weak authentication presents.  Configure  services  to  use
       only  two factor or public/private authentication mechanisms if you really want to protect
       services.

       A local user is able to inject messages into syslog and using a Fail2Ban jail  that  reads
       from  syslog, they can effectively trigger a DoS attack against any IP. Know this risk and
       configure Fail2Ban/grant shell access accordingly.

FILES

       /etc/fail2ban/*

AUTHOR

       Manual page written by Daniel Black and Yaroslav Halchenko

REPORTING BUGS

       Report bugs to https://github.com/fail2ban/fail2ban/issues

COPYRIGHT

       Copyright © 2013
       Copyright of modifications held by their  respective  authors.   Licensed  under  the  GNU
       General Public License v2 (GPL).

SEE ALSO

       fail2ban-server(1) fail2ban-client(1) fail2ban-regex(1) jail.conf(5)