You may have a Cable or DSL modem hooked up to a ROUTER. If you do, your router may be blocking port 80. Port 80 is used for Web services. Instructions for setting up your router to allow port 80 to forward through your router to your computer can explained by your routers manufacture. You may try the following web site before you call them it could save you time on the phone.

Here is a good site for explaining how to setup your router for port forwarding.

1. Go to the url
2. Select your router
3. Select HTTP (which is web site services) from the program list
4. Follow the instructions

http://www.portforward.com/english/routers/port_forwarding/routerindex.htm

 

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If you have a Router it may be blocking port 80 (web sites)