when i back the site browser shows problem in loading page

   Check to make sure you’ve typed the website address correctly and try again in a few moments.
   Check your network connection.
   Check that Firefox has permission to access the web (you might be connected but behind a firewall).

when i work in any web page and i try to back to previous page browser disconnect the page and shows loading page error (problem loading page). Is this a browser problem or any network issue , after update this shows multiple times when i try to go to previous page . ''''''problem that i face '''''' Server Not Found Firefox can’t connect to the server at scholarship.up.nic.in. What can you do about it? Check to make sure you’ve typed the website address correctly and try again in a few moments. Check your network connection. Check that Firefox has permission to access the web (you might be connected but behind a firewall). Learn more… Try Again