Excellent System Utilities: Fail2ban – ban hosts that cause multiple authentication errors
Fail2Ban is a daemon to ban hosts that cause multiple authentication errors. Fail2Ban is free and open source software.
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There are a number of ways to secure a cloud server. High up on the list are to disallow root password logins, force login via SSH keys, enable automatic and unattended upgrades, install and configure logwatch, listen on only one internet protocol, and to install Fail2ban.
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