Are you able to access the web server(port 80) via local network? like from one computer to the one that has the server on it? If not either the process is not running or there is a firewall on the one being used as a server. Or, if it is apache, it may not be fully setup. You have to go in and edit the httpd.conf file for it. To make it accept incoming connections. Im pretty sure, but I dont think it does by default unless you are using some sort of cpanel type software to set it up. All the apache install's I have ever done I have had to go in and edit alot of the settings in the .conf file via VIM before It would start accepting connections. Also once you edit the file you have to restart apache.