What ways to protect Linux servers do you know and can you advise me?

Users are given access only to lower level accounts with limited access. When a Linux system is compromised, virus or malware will not get the root access to damage system wide. Only local files and programs of users will be affected, as the normal user will not have access permission to all the files in the system.

About server protection, I can only say that Fail2Ban is the best free open source software that protects Linux servers from brute force attacks, check https://daintycloud.com/how-to-install-fail2ban-to-secure-linux-servers/. I might also add that it works by monitoring system logs for failed login attempts and automatically blocks IP addresses that exceed a certain number of failed attempts.

Regular software updates are essential. Keep your server's operating system and applications up to date with the latest security patches. Automated updates can simplify this process and ensure vulnerabilities are addressed promptly.

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