Red Hat Firewall Configuration

In a default Red Hat Enterprise Linux installation, a firewall exists between your computer or network and any untrusted networks, for example the Internet. It determines which services on your computer remote users can access. A properly configured firewall can greatly increase the security of your system. It is recommended that you configure a firewall for any Red Hat Enterprise Linux system with an Internet connection.

e.g in AWS EC2 Red Hat instance, a tomcat installation doesn't allow access by outside network via port 8080. It can be blocked by Red Hat default firewall.

two ways to resolve this firewall:

One via Red Hat Window:

To start this application, either select System → Administration → Firewall from the panel, or type system-config-firewall at a shell prompt.

Another is run from shell, type in command: system-config-firewall

remove Enable in firewall and open the connection from outside traffic.