During the Firewall Configuration screen of the Red Hat Enterprise Linux installation, you were given the option to enable a basic firewall as well as to allow specific devices, incoming services, and ports.
After installation, you can change this preference by using the Security Level Configuration Tool.
To start the application, select Main Menu Button (on the Panel) => System Settings => Security Level or type the command system-config-securitylevel from a shell prompt (for example, in an XTerm or a GNOME terminal).
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