Just to add...I tried this
From the computer connected to the modem, try to connect to your server by typing in the IP address if your DSL/Cable connection. If this works, great, if not, then we have bigger problems.
If you cannot connect to the sever by the IP address, try to ping your DSL/Cable IP number from the computer still on the modem.
* If this works, that means your router is good, and the problems like with things downstream of the router such as the network or webserver.
I couldnt connect via my browser but was able to ping the IP address no worries.