Nginx default server

nano /etc/nginx/sites-available/default

server {  
    listen 80 default_server;
    listen [::]:80 default_server;
    listen 443 ssl http2 default_server;
    listen [::]:443 ssl http2 default_server;
    server_name _;
    ssl_ciphers NULL:aNULL:MD5:ADH:RC4;
    ssl_certificate crts/dummy.pem;
    ssl_certificate_key crts/dummy.key;
    return 444;
}

ln -s /etc/nginx/sites-available/default /etc/nginx/sites-enabled/default