server {
    listen 80 default_server;
    listen [::]:80 default_server;
    server_name _;
    return 444;
}

server {
    listen 443 ssl default_server;
    listen [::]:443 ssl default_server;
    server_name _;

    ssl_certificate /etc/nginx/certs/default_server.crt;
    ssl_certificate_key /etc/nginx/certs/default_server.key;

    return 444;
}