# phpman > man > fail2ban(1)

[FAIL2BAN(1)](https://www.chedong.com/phpMan.php/man/FAIL2BAN/1/markdown)                            General Commands Manual                           [FAIL2BAN(1)](https://www.chedong.com/phpMan.php/man/FAIL2BAN/1/markdown)



## 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 authenti‐
       cation 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)](https://www.chedong.com/phpMan.php/man/jail.conf/5/markdown) 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)](https://www.chedong.com/phpMan.php/man/fail2ban-server/1/markdown) manual
       page.

       For details on the command-line options and commands for configuring the server via fail2ban-
       client see the [fail2ban-client(1)](https://www.chedong.com/phpMan.php/man/fail2ban-client/1/markdown) 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)](https://www.chedong.com/phpMan.php/man/fail2ban-regex/1/markdown).


## 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 config‐
       ure 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)](https://www.chedong.com/phpMan.php/man/fail2ban-server/1/markdown) [fail2ban-client(1)](https://www.chedong.com/phpMan.php/man/fail2ban-client/1/markdown) [fail2ban-regex(1)](https://www.chedong.com/phpMan.php/man/fail2ban-regex/1/markdown) [jail.conf(5)](https://www.chedong.com/phpMan.php/man/jail.conf/5/markdown)



Fail2Ban                                     March 2013                                  [FAIL2BAN(1)](https://www.chedong.com/phpMan.php/man/FAIL2BAN/1/markdown)