Jetpack: site_inaccessible
Error Details: The Jetpack server was unable to communicate with your site [HTTP 403]. Ask your web host if they allow connections from WordPress.com. If you need further assistance, contact Jetpack Support: http://jetpack.me/support/
I’ve seen this error when there were blocks in the .htaccess file which was limiting access to xmlrpc.php. Jetpack itself needs to be able to access that file, so to allow access to Jetpack’s servers try allowing these ip’s in the .htaccess rules:
Allow from 192.0.64.0/18
Allow from 209.15.0.0/16
Allow from 66.155.0.0/17