Can you contact your hosting provider and explain to them that we are unable to access your blog via cURL, which is needed in order to use Jetpack on your site.
You can let them know we tested the following:
1. Check for access to xmlrpc.php via browser:
http://somethingdivine.altervista.org/xmlrpc.php
That test returned "XML-RPC server accepts POST requests only." which is a valid result.
2. Check for access via cURL by running the following command from the command prompt:
curl -A "Jetpack by WordPress.com" -is -H 'Content-Type: text/xml' --data '<?xml version="1.0"?><methodCall><methodName>demo.sayHel lo</methodName><params></params></methodCall>' 'http://XXXXXXXXXXXXXXX.com/xmlrpc.php' && echo
The cURL test returned the following invalid result:
HTTP/1.1 403 Forbidden
Date: Thu, 11 Sep 2014 18:07:12 GMT
Content-Type: text/html
Transfer-Encoding: chunked
Connection: keep-alive
Set-Cookie: __cfduid=de093986472fd826a4d5f12c525c2df0614104588 32352; expires=Mon, 23-Dec-2019 23:50:00 GMT; path=/; domain=.somethingdivine.altervista.org; HttpOnly
Server: cloudflare-nginx
CF-RAY: 1685cdb638b6077f-EWR