While working with linux os, We need to open some kinds of port like for Apache tomcat ssl application server, Use the following command for the same.
Step 1: Allow the Port 8443
You need to execute the given command to allow port 80 using UFW utility.
sudo ufw allow 8443
Step 2: Get UFW firewall Status
Now we need to check and verify the open port by using the given command.
sudo ufw status
How to open port 8443 using UFW firewall on ubuntu linux