Unable to load default Nginx start page in browser - php

Question

Following this tutorial for setting up a LEMP stack on Ubuntu 16.04, I am unable to load the default page in the browser:
https://www.digitalocean.com/community/tutorials/how-to-install-linux-nginx-mysql-php-lemp-stack-in-ubuntu-16-04
I am trying to pull up the page by requesting the server IP address in the browser, i.e. typing http://server_ip_address into Chrome.
The connection times out. However, I am able to run
$ curl server_ip_address
and return the html in the terminal.
What am I doing wrong here?
Update: Resolved. Ended up being an issue with Cloudflare; had non-Cloudflare IP addresses blocked. So, there was no Nginx issue.

Answer 1

Check if you have the service running on the server by using: netstat -lt command
If the service is running then check if you have the security group rules against it
If both the above conditions are good then try accessing the start page on the port on which the service is running
Note:
Make sure nginx is running on port 80
Make sure you stopped apache2

Answer 2

(1)Run "curl" test at another host, not in the ${server_ip_address} itself.
(2)If you get the right result at step 1, then you will get the same result at chrome.
(3)Check the firewall of ${server_ip_address} host,such as:
netstat -ntpl | grep ${port_of_nginx}
iptables -L -n | grep ${port_of_nginx}