Jeremy Herve on "[Plugin: Jetpack by WordPress.com] Jetpack: site_inaccessible"

Do you use a self-signed SSL certificate on your domain? If so, you won't be able to use Jetpack without making a small addition to your site's wp-config.php file:

define( 'JETPACK_CLIENT__HTTPS', 'NEVER' );

If that doesn't help, can you please use Jetpack's Debugger module to send us some more information about your site?

1) Go to the Jetpack page in your dashboard.
2) Click on the Debug link appearing at the bottom of the page.
3) Click the link that says "click here to contact Jetpack support."
4) Fill in the description box and your name and email address.
5) Click the "Contact Support" button.

Thanks!