Hardening the Linux server

"Objectives
After completing this tutorial, you will know basic concepts in security administration, including how to secure Secure Shell (SSH) remote logins, create firewall rules, and watch logs for possible attacks.

"Prerequisites
This tutorial is written for the beginning GNU/Linux user. You should have some familiarity with operating system installations and the command line. To fully understand the concepts in this tutorial, you should have gone through the companion tutorial, "Hardening the Linux desktop.""
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