On Terminal
Logged in as root.
Run the following command.
firewall-cmd --zone=public --add-port=2888/tcp Note this doesnot survive Reboots. Here is How to configure open firewall ports that survive Reboots.
Start by finding your active zones by running the following command.
firewall-cmd --get-active-zones
If the Zone is Public run the following:
firewall-cmd --zone=public --add-port=2888/tcp --permanent firewall-cmd --reload
(for public active zone)
If its a different zone run the following.
firewall-cmd –zone=dmz –add-port=2888/tcp –permanent
Enjoy Server Administration.