Server hardening refers to the process by which maximum pieces of security software are installed and configured on the server to help prevent different security threats. Some key steps involved in server hardening are:
CSF: CongfigServer Security Firewall has become an inevitable part of cPanel servers as it strengthens the security layer significantly. Instead of acting as a mere firewall, it can also be configured to monitor emailing, server load, processes, etc., all of which make it an effective security suit for the server.
Apache: Securing Apache is another important step. Usually, it’s recommended to set everything to ‘PCI Compliant’ in WHM’s Apache Global Configuration. You should also consider enabling SymLink Security Patch from EasyApache (in case you don’t have CloudLinux kernel installed), disabling Directory Listing, and enabling PJP Open Base Dir Restriction.
Disabling unwanted processes that aren’t required for OS installation, tweaking some kernel variables to prevent attacks like SYNFLOOD, and making security tweaks to cPanel like disabling compiler access, background process killer, enforcing SSL, etc., are some other ways that are used for server hardening.