Installing Origin CA certificate in NGINX getting Error 521: Web server is down error

[mainakghosh.mg98]

After reading How to install an Origin CA certificate in NGINX this article i just add this few line of code after listen 443;,
code are :-

ssl on;

    # ssl_certificate         /var/www/ssl/certificatefree.pem;
    # ssl_certificate_key     /var/www/ssl/freekey.key;

then trying to open the website and getting Error 521: Web server is down error.
CAn anyone help me here to fix my problem.

[Judge]

Try removing the pound symbols (#).