This is my configuration:

server {
listen 80;
server_name shell.*;
return 301 https://$server_name$request_uri;
}

server {
listen 443 ssl;
server_name shell.*;

location / {
proxy_pass http://192.168.0.16:4200;
}
}

I am using a Dynamic DNS Service to access NGINX running on my Raspberry Pi.

The configuration perfectly works for https://shell.raspi.dyndns.com but not for http://shell.raspi.dyndns.com (message: The requested URL could not be retrieved. The system returned: Operation timed out.).

Any idea what the problem could be and how to fix it?

Regards,
Steffen