After entering the username, the site is not connecting.

I get this error after entering the username:

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.