Hi,

Please add the below line inside your nginx file . you need to add this inside the location
proxy_set_header X-Forwarded-Proto https;

example
location /longpolling {
                proxy_connect_timeout   3600;
                proxy_read_timeout      3600;
                proxy_send_timeout      3600;
                send_timeout            3600;
                proxy_set_header X-Forwarded-Proto https;
                proxy_pass http://127.0.0.1:8072;
        }

After adding it , save the file and restart nginx service

Hope it helps