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1
To be able to reach your instance over http, you also need to run a webserver on your instance. Have you started the httpd service on your instance? You can validate if the instance is listening on port 80/443 using 'netstat -an' . You should definitely be able to SSH to the instance and validate http settings.
0
What's an example youtube tutorial you've followed that didn't work? How exactly did you try to connect to the instance, and what exactly was the error you got?
Like, in EC2 instance external link IP:Port_Number with that my app is open but not with public ipv4 or DNS ip
But I saw so many youtube tutorials like they created EC2 and open public ipv4 address and it displays some kind of IP and zone, without using httpd or Nginx server. How it is possible?