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I have my modem with 4 ports. 1 is linked to the router while 1 is linked directly to my computer. Now I can access my webserver with some in my computer. But my friend reported to me that he cannot access it on his computer. Is there anything to do with the router?

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Need a little more info here... Where is your web server at? Is it behind the router? Please paint us a better picture of your network. –  Tanner Faulkner Nov 1 '12 at 15:31
It sounds like you actually have two routers. If your "modem" has four ports, it almost certainly has a built-in router. It's very easy to mess up a configuration like that. For example, if you connected your router's "Internet" (or "WAN") port to the modem, that's a problem, since you've actually connected it to one of the modem's LAN ports, not a WAN. It's almost impossible to get port forwarding working with double-NAT. –  David Schwartz Nov 1 '12 at 17:45

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