default_server directive not respected

[Lorenzo Raffio]

I have multiple files each with a config for a different vhost.
On one of these config files (included in the main nginx config file) I set
the default_server directive:

    server {

    listen 80;
    listen 443 ssl default_server spdy;
    server_name 188.166.X.XXX;
    root /var/www/default;
    index index.php index.html;
      ...
    }

... but it's not respected. If I point the A record of a domain I didn't
add in a nginx server block, the first server block in alphabetical order
is picked up (instead of the default_server).
Why?
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