fail2ban
Bans IP addresses that make too many authentication failures
Fail2ban scans log files like /var/log/messages and bans IP addresses that makes too many password failures. It updates firewall rules to reject the IP address, can send e-mails, or set host.deny entries. These rules can be defined by the user. Fail2Ban can read multiple log files such as sshd or Apache web server ones.
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