Now you have the Apache Web server running, but before it can answer World Wide Web requests from machines on your network or from the Internet at large, you must configure your firewall to allow World Wide Web requests. To do this, start the Security Level Configuration tool by clicking GNOME Menu, System Settings, Security Level.
In the Security Level Configuration tool, select your desired level of security, and then select the Customize option and ensure that you also check the WWW (HTTP) option in the Allow Incoming area.
Be sure to reenter your list of ports for other services (if you have them) into the Other Ports entry box because each time you run the Security Level Configuration tool, it replaces your old settings. Click the OK button to exit the Security Level Configuration tool when you are done.
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