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→Web Server Firewall Issues
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.
Once everything is configured it should be possible to enter the domain name of your web site into a browser anywhere in the world and access your web server.