Changing main domain to https + paying the cost

[inna]

Hello,

I have opened port 443 in my server and when I use telnet ip 443, it works fine, but when I enter https://mysite.com it shows me ERR_SSL_PROTOCOL_ERROR. And when I use https://ip it takes much time to load and then show me it can't be reached.
Can anyone help me regarding this issue? I will pay its costs in order to run my website with SSL.

Server: Ubuntu
Mongodb
Nginx
It is VPS and only one website is hosted.
Domain: http://pythonforum.ir

And I want to be sure that if I update/upgrade nginx in the future, the settings will not be replaced by the default ones.

Thanks in advance

[julian]

@inna you'll want to generate an SSL certificate with Let's Encrypt (you can see the directions on their website)

Certbot