Improved 444 configuration: replaced the letsencrypt certificate (which
won't work here anyway) with the self signed certificates bundled with
nginx (the more broken, the merrier in this case... confuse the bots!):

server {
listen 80 default_server;
listen [::]:80 default_server;
listen 443 ssl default_server;
listen [::]:443 ssl default_server;
include snippets/snakeoil.conf;

server_name _;

return 444;
}
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