the whole site wont load

i get this when trying to load page

The connection was reset
                The connection to the server was reset while the page was loading.
       
  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.