→Adding a rule
* Install links (a command-line web browser) and see if you can connect to http://localhost (it should work by default).
* Try to use Firefox on c7host to see the same webpage from lin1 (it should not work by default).
If you check your iptables rules you should be able to figure out why you can't connect.* Add a rule on lin1 to allow inbound traffic to Apache (TCP port 80).
If you make such a mess that you don't know what you did any longer, there are a couple of things that can help you get back to normal: