Firewalls

Mitigating DoS and DDoS attacks is challenging. There’s no way to prevent them, but we can reduce their impact and, in extreme cases, take the server temporarily offline.

The Login Failure Daemon (LFD) monitors and blocks brute-force login attempts on your server. WHM allows you to configure and track LFD settings.

A firewall is like a security guard for your server. It checks all network traffic against a list of rules to block unauthorized access.

FirewallD provides protection by using firewall zones with varying degrees of trust defined in your zone profiles. FirewallD allows for changes to be made without having to restart the entire firewall, though it is important to make sure that the daemon and the firewall in kernel are in sync.

Each open firewall port is a potential vulnerability. It’s vital to keep all ports closed except for those essential for your server’s applications.

Windows servers using Plesk can use firewall rules to manage help manage server traffic. You can also add firewall rules using Windows Firewall, but adding firewall rules in Plesk is a good first line of defense.

Learn about changes to CSF Country Blocking requiring that a key is obtained. Then, there is a value in /etc/csf/csf.conf that needs to be updated with the free license key.

If an IP address has been blocked by the firewall on your cPanel VPS server unexpectedly, you can quickly resolve the issue yourself with just a little help.

Zones enhance an administrator’s capability to define trusts and restrict network traffic. Learn how to find the default zone in Firewalld on CentOS 7 via the command line.