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Fail2Ban is an open-source tool that monitors log files, such as /var/log/auth.log, and blocks IP addresses that exhibit repeated failed login attempts. It does this by updating system firewall rules to reject new connections from those IP addresses for a configurable amount of time. Fail2Ban features “Fail2Ban is a versatile and effective tool. It can block common attacks using community-driven filters with minimal configuration. Additionally, it can serve as a complex IDS/IPS system to meet … More → The post Fail2Ban: Ban hosts that cause multiple authentication errors appeared first on Help Net Security.