Linux Hint published a quick tutorial about disabling the CentOS 8 firewall.

CentOS 8 Disable Firewall 

A firewall is considered as the "First Line of Defense" within any operating system. It prohibits any unauthorized access to your system hence preventing it from all potential harms. However, at times it happens that you are performing a critical task, and your Firewall causes hindrance. In such situations, you need of disabling your Firewall. In this article, the methods of disabling the Firewall in CentOS 8 are explained.

CentOS 8 Disable Firewall – Linux Hint