Nginx

Step 1 — Installing the Certbot Let’s Encrypt Client

To use Let’s Encrypt to obtain an SSL certificate, you first need to install Certbot and mod_ssl, an Apache module that provides support for SSLv3 encryption.

The certbot package is not available through the package manager by default. You will need to enable the EPEL repository to install Certbot.

Go to the Nginx  configuration then you need to edit the line similar to this line 

location ~ (index|get|static|report|404|503)\.php$ {

to be like this 

location ~ (index|get|static|report|404|503|phpinfo)\.php$ {

then restart Nginx