Changes

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If your Ubuntu Linux system is configured to use a firewall, you will need to ensure that HTTP traffic on port 80 is permitted in order for external system to be able to access your web server. Refer to the [[Basic Ubuntu Linux Firewall Configuration]] and [[Using Firestarter to Configure an Ubuntu Linux Firewall]] chapters of this book for details on configuring Ubuntu Linux Firewalls.

If the Ubuntu Linux system hosting your web server sits on a network protected by a firewall (either another computer running a firewall, or a router or wireless base station containg built in firewall protection) you will need to configure the firewall to forward port 80 to your web server system. The mechanism for performing this differs between firewalls and devices so check your documentation to find out how to configure port forwarding.