Chapter 5. Modifying firewall rules
Chapter 5. Modifying firewall rules 5.1. Modifying firewall rules for disk encryption On Network-Bound Disk Encryption (NBDE) key servers, you need to open ports so that encryption keys can be served. Procedure On each NBDE key server: Open ports required to serve encryption keys. Note The default port is 80/tcp . To use a custom port, see Deploying a tang server with SELinux in enforcing mode in the Red Hat Enterprise Linux 8 documentation. Verify that the port appears in the output of the following command.
firewall-cmd --add-port=80/tcp firewall-cmd --add-port=80/tcp --permanent firewall-cmd --list-ports | grep '80/tcp'