I'm trying to make a Linux webserver (Redhat 7.2), but I have a 'little' problem with it.
The server itself is running, I can load the pages on it. The problem is that I can load them only from the computer that is the server. When I try to connect to it from another computer (through LAN) my browser says: "Connection closed by remote server". From the server I can connect to Internet so the problem is not in the hardware. (The Internet connection is shared by another computer)

Any ideas what might be wrong?

you're probably firewalling out the port.

I think I have the firewall set up correctly.
Firewall configuration says that all TCP activity from anywhere to the port 80 is accepted.

what do u put in Servername option:
Servername UrIP or hostname