Guides

Last updated: October 23, 2026

Practical fixes for problems that Linux servers actually have. Each guide gives the manual solution first, complete, with commands for Debian, Ubuntu and the RHEL family, then how InfraFence handles the same thing.

• How to stop SSH brute force attacks

  Key-only login, no root, the port change and what it does not do, fail2ban or sshguard, and rate limits at the firewall.

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• Secure a new VPS: the checklist

  Ten steps for the first hour of a new server, from updates and SSH to backups, time sync and log retention.

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• How to find and remove a crypto miner on your server

  Spot it (CPU, process names, pool connections, cron, systemd, ld.so.preload), contain it, remove it, find the way in and close it.

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• How to block AI crawlers on your server

  robots.txt and what it cannot do, user-agent rules in nginx and Apache, checking real bots by reverse DNS, and rate limits.

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