INTRODUCTION

Installing an SSL Certificate on NGINX is the basic process for all web servers wold wide, encrypts the data transmitted over the internet without be an interception by a third party.

Step 1: Combine All Certificates into a Single File

Concatenate the 2 files provided by the Certificate Authority (CA), you should receive the SSL certificate in a .zip file

a) If all three certificates are listed separately, use the command:
cat infinitynetwork_ro.crt infinitynetwork_ro.ca-bundle root.crt > /etc/ssl/certs/fullchain_infinitynetwork_ro.crt
the private key can be placed in /etc/ssl/private/infinitynetwork_ro.key

b) If the intermediate certificates are in one bundle, run:
cat infinitynetwork_ro.crt infinitynetwork_ro.ca-bundle > /etc/ssl/certs/fullchain_infinitynetwork_ro.crt
the private key can be placed in /etc/ssl/private/infinitynetwork_ro.key

Step 2: Add the paths to certificates locations

In the /etc/nginx/sites-available/default

server {
listen 443 ssl http2;
listen [::]:443 ssl http2;
ssl_certificate /etc/ssl/certs/nfullchain_infinitynetwork_ro.crt;
ssl_certificate_key /etc/ssl/private/infinitynetwork_ro.key;
....
}

Save, exit, and restart the server:

sudo systemctl restart nginx