Warning: your browser doesn't send the HTTP_REFERER header to the website.
This can be caused due to your browser, using a proxy server or your firewall.
Please change browser or turn off the use of a proxy
or turn off the 'Deny servers to trace web browsing' in your firewall
and you shouldn't have problems when sending a POST on this website.
Como se soluciona?:
1. Escribe about:config en la barra de direcciones del navegador (Mozilla firefox).
2. Busca el campo "network.http.sendRefererHeader" (Usa el filtro).
3. Y fijate que los valores sean predeterminado, entero y 2 (seguro que aqui no tienes un 2 y tendras que cambiarlo).
4. Recarga/actualiza la página.
