Configure ssl certificate for nginx

I have installed nginx 1.6 on my droplet and I’m trying to configure an ssl certificate to use https connection. I created the certificate with openssl as described in this tutorial:

When i access the https url from my browser I have no response. I’m sure port 443 is opened because of this:

netstat -tulpn | grep 443
tcp        0      0 0.0.0.0:443             0.0.0.0:*               LISTEN      8603/nginx.conf

Moreover if I try to wget --no-check-certificate https://<server_url> I correctly get the index.html page

I suppose the problem is that the certificate is untrusted but the only error in my browser is ERR_CONNECTION_RESET

What am I doing wrong? Thanks in advance.