cURL throw cURL error 7 Connection refused – Nginx

I’m want get content of my page via cURL soo…

1. First time of execute script, I’m got content
2. Refreshing page
3. I’m getting ‘cURL error 7: Failed to connect to <my.site> port 443: Connection refused’
4. I’m wait 5 minutes
5. Refreshing page
6. And… I’m getting content now, but when refresh: goto point 3…

What’s fun, when I’m make request via Postman so I’m all time getting content of my page…??

Map of connection

Domain going to router, router say: ‘goto nginx server’, next nginx server pass connection via proxy_pass to page_vm.

nginx config

server {
        listen 5443 ssl;
        server_name <my.site>;

        location / {
                proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
                proxy_set_header Host $http_host;
                proxy_set_header X-Forwarded-Proto https;
                proxy_redirect off;
                proxy_buffering off;
                proxy_pass http://192.168.42.10:82;
                proxy_http_version 1.1;
        }

        ssl_ciphers HIGH:!aNULL:!MD5;
        ssl_certificate fullchain.pem;
        ssl_certificate_key privkey.pem;
}

Did someone can help me? I’m spend 4 hours today to this…