Johnpilz:
if you installed software firewall sa imong web server try to disable it first? check dayon if maka forward ba. try to check kung naay packets nga ni sulod sa imong web server gikan sa router/modem.
then ang ip sa local sa modem/router dapat same sa web server para magkta or create ka route entry or get switch/router and attach one end to the router/modem the other end sa imong network switch where the web server is connected para maka forward sya to another subnet, in case lahi ug subnet.
sa imong modem/router, try to disable the firewall too or put the IP of your web server sa DMZ. makita man kaha sa modem/router imong web server?
btw, linux or windows web server?