This is happening when I try to connect ubuntu EC2 instance in my ubuntu system.

Any success in other browsers or from other computers?

Also, your Firefox identified itself to the forum as version 57. As you may know, the current versions of Firefox are:

• Regular release: 64.0 (Installers)
• Extended Support Release (ESR): 60.4.0esr (Installers

(Note for 64-bit Windows users: How to switch from 32-bit to 64-bit Firefox)

If something is holding you back from upgrading Firefox, please let us know so we can suggest solutions or workarounds. Version 57 is not secure.

The issue still present

This did not resolve the problem.

Is it possible to have google instead of firefox in my system. I have partitioned my laptop into 2, the first one is windows 10 and the other is ubuntu. When I execute AWS EC2 instance IP at firefox , it is not working and it gives the error that I mentioned earlier.

Unable to connect

Firefox can’t establish a connection to the server at x.xx.xxx.xxx.

  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

Are you using a link to a specific server that might no longer be available or are you using an IP address?

If you use an IP address then try to append the port number (:443 for a secure connection).

If you use a bookmark then navigate to the web page starting with the main page or the sign in page in case there is a problem with this bookmark.

Ananth13 said

Is it possible to have google instead of firefox in my system.

You can install as many or as few browsers as you like. You already have Edge and probably Internet Explorer 11 (or you can easily add IE, which is useful for sites that require Java or Silverlight). You can install Google Chrome, Opera, whatever you like. For testing purposes, the more the merrier.