{
    "mode": "man",
    "parameter": "FAIL2BAN",
    "section": "1",
    "url": "https://www.chedong.com/phpMan.php/man/FAIL2BAN/1/json",
    "generated": "2026-07-05T13:25:57Z",
    "sections": {
        "NAME": {
            "content": "fail2ban - a set of server and client programs to limit brute force authentication attempts.\n",
            "subsections": []
        },
        "DESCRIPTION": {
            "content": "Fail2Ban  consists of a client, server and configuration files to limit brute force authenti‐\ncation attempts.\n\nThe server program fail2ban-server is  responsible  for  monitoring  log  files  and  issuing\nban/unban  commands.   It gets configured through a simple protocol by fail2ban-client, which\ncan also read configuration files and  issue  corresponding  configuration  commands  to  the\nserver.\n\nFor  details  on  the configuration of fail2ban see the jail.conf(5) manual page.  A jail (as\nspecified in jail.conf) couples filters and actions definitions for any given list  of  files\nto get monitored.\n\nFor  details on the command-line options of fail2ban-server see the fail2ban-server(1) manual\npage.\n\nFor details on the command-line options and commands for configuring the server via fail2ban-\nclient see the fail2ban-client(1) manual page.\n\nFor testing regular expressions specified in a filter using the fail2ban-regex program may be\nof use and its manual page is fail2ban-regex(1).\n\n",
            "subsections": []
        },
        "LIMITATION": {
            "content": "Fail2Ban is able to reduce the rate of incorrect authentications attempts however  it  cannot\neliminate  the  risk  that  weak authentication presents.  Configure services to use only two\nfactor or public/private authentication mechanisms if you really want to protect services.\n\nA local user is able to inject messages into syslog and using a Fail2Ban jail that reads from\nsyslog,  they can effectively trigger a DoS attack against any IP. Know this risk and config‐\nure Fail2Ban/grant shell access accordingly.\n\n",
            "subsections": []
        },
        "FILES": {
            "content": "/etc/fail2ban/*\n",
            "subsections": []
        },
        "AUTHOR": {
            "content": "Manual page written by Daniel Black and Yaroslav Halchenko\n",
            "subsections": []
        },
        "REPORTING BUGS": {
            "content": "Report bugs to https://github.com/fail2ban/fail2ban/issues\n",
            "subsections": []
        },
        "COPYRIGHT": {
            "content": "Copyright © 2013\nCopyright of modifications held by their respective authors.  Licensed under the GNU  General\nPublic License v2 (GPL).\n",
            "subsections": []
        },
        "SEE ALSO": {
            "content": "fail2ban-server(1) fail2ban-client(1) fail2ban-regex(1) jail.conf(5)\n\n\n\nFail2Ban                                     March 2013                                  FAIL2BAN(1)",
            "subsections": []
        }
    },
    "summary": "fail2ban - a set of server and client programs to limit brute force authentication attempts.",
    "flags": [],
    "examples": [],
    "see_also": [
        {
            "name": "fail2ban-server",
            "section": "1",
            "url": "https://www.chedong.com/phpMan.php/man/fail2ban-server/1/json"
        },
        {
            "name": "fail2ban-client",
            "section": "1",
            "url": "https://www.chedong.com/phpMan.php/man/fail2ban-client/1/json"
        },
        {
            "name": "fail2ban-regex",
            "section": "1",
            "url": "https://www.chedong.com/phpMan.php/man/fail2ban-regex/1/json"
        },
        {
            "name": "jail.conf",
            "section": "5",
            "url": "https://www.chedong.com/phpMan.php/man/jail.conf/5/json"
        }
    ]
}