You installed Jira 7.x on RHEL 7.x in AWS. You try to go to the URL to finish installing and configuring it, but the web UI does not load. On the back-end you see that there is a service listening on port 8080 (with a sudo netstat -anlp | grep 8080 command). You know that now AWS Security Group is blocking port 8080 from the external IP address of the server.
From the front-end you use the URL http://x.x.x.x:8080 (where x.x.x.x is the external IP address of the RHEL server) but the web browser says "Page not accessible" or "The connection was reset."
How do you access Jira for the first time via a web browser?
Turn off firewalld or reconfigure it to allow connectivity over port 8080. This software firewall runs by default on RHEL servers in AWS.