Fedora 18 firewall.

I upgraded to Fedora 18.  Then verified my web server was running.  Then attempted to visit this site.  I was not able to.    The problem was the new firewall daemon in Fedora 18.   Despite the config file indicating that port 80 was open for http traffic, it was not.

I had to install firewall-config.

yum install -y firewall-config

Then I used firewall-config enable traffic for port 80.  This solved the problem.