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cannot connect to server when web sites are selected. IE will connect.

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the window for firefox comes up, but when a web site is selected in the browser this is presented: Unable to connect




         Firefox can't establish a connection to the server at www.facebook.com.
       



 The site could be temporarily unavailable or too busy. Try again in a few
   moments.
 If you are unable to load any pages, check your computer's network
   connection.
 If your computer or network is protected by a firewall or proxy, make sure
   that Firefox is permitted to access the Web.
the window for firefox comes up, but when a web site is selected in the browser this is presented: Unable to connect Firefox can't establish a connection to the server at www.facebook.com. The site could be temporarily unavailable or too busy. Try again in a few moments. If you are unable to load any pages, check your computer's network connection. If your computer or network is protected by a firewall or proxy, make sure that Firefox is permitted to access the Web.

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This happens for all web sites?? This troubleshooting article has a number of suggestions. Hopefully one of them will fix it.

Firefox cannot load websites but other programs can | Troubleshooting | Firefox Help