Veja o link
# whitelist php files que são chamados diretamente e precisam ser interpretados location = /framework/thirdparty/tinymce/tiny_mce_gzip.php { incluem fastcgi_params; fastcgi_pass unix: /var/run/php5-fpm.sock; }
location = /framework/thirdparty/tinymce-spellchecker/rpc.php {
include fastcgi_params;
fastcgi_pass unix:/var/run/php5-fpm.sock;
}