RHEL/firewalld

List Ports

firewall-cmd --add-port=80/tcp --permanent
firewall-cmd --reload

systemctl status firewalld
# or
firewall-cmd --state

firewall-cmd --get-services

firewall-cmd --zone=public --add-service=http
firewall-cmd --zone=public --add-service=https

firewall-cmd --zone=public --add-port=27000/tcp  # flexlm lmgrd service

ref: [1]

--

Add to startup:

firewall-cmd --zone=public --add-service=http --permanent
firewall-cmd --zone=public --add-service=https --permanent

firewall-cmd --zone=public --add-port=27000/tcp --permanent  # lmgrd

If you didn't use the --permanent, to save:

firewall-cmd --runtime-to-permanent

ref: [2]