Security
fail2ban
Intrusion Prevention - Blocks attackers after failed logins.
Ubuntu
Debian
Fedora
CentOS
RHEL
Verified: 2026-05-10
Syntax
$fail2ban-client [COMMAND]
Examples
$fail2ban-client status
$fail2ban-client set sshd ban IP
$fail2ban-client -v start
Typical use cases
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Standard usage
fail2ban --help
Note
Monitors logfiles and bans IPs after configurable rules. Config in /etc/fail2ban/
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