I am having the same issue.
Here is the server block of my nginx.conf -
#########
server{
listen 8090 ssl;
server_name foo.bar.com;

ssl_certificate conf.d/ssl/foo.bar.com.crt;
ssl_certificate_key conf.d/ssl/foo.bar.com.key;

keepalive_timeout 60;

location / {
proxy_pass https://127.0.0.1:8010;

### force timeouts if one of backend is died ##
proxy_next_upstream error timeout invalid_header http_500 http_502 http_503;

### Set headers ####
proxy_set_header Host $host;
proxy_set_header X-Real-IP $remote_addr;
proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;

### Most PHP, Python, Rails, Java App can use this header ###
proxy_set_header X-Forwarded-Proto https;

### By default we don't want to redirect it ####
proxy_redirect off;

}
location ~ /\.ht {
deny all;
}
}
#########
As you can see I am using other port than 443. How do I make it work?