nginx-config/sites-available/default

# Denies the access without the pre-defined virtual host.
server {
  listen 80 default_server;
  listen 443 ssl default_server;
  server_name _;

  ssl_certificate /etc/lego/.lego/certificates/_.kazu634.com.crt;
  ssl_certificate_key /etc/lego/.lego/certificates/_.kazu634.com.key;

  return 444;
}