Dal mio contatto con il team di Jetpack mi hanno inviato questo link:
https://wordpress.org/support/topic/...1#post-6069701
La mail completa è questa
Hi again, Pino!
Thanks for that information.
To display the Jetpack stats page within your Dashboard, Jetpack makes a call to dashboard.wordpress.com, and AlterVista could be blocking that call. You can see a related thread on the WordPress forums here:
https://wordpress.org/support/topic/...1#post-6069701
You can actually send that link to your host and ask them to do the dig test that Barry mentioned, to see if they get proper IPs for dashboard.wordpress.com.
Could you also give us the IP of your server, so we can double-check that it isn't WordPress.com that is blocking you?
Cheers,
Jen H.
Happiness Engineer
WordPress.com