after changing server
and disconnect to wordpress.com
to connect to wordpress
Error Details: The Jetpack server could not communicate with your site's XML-RPC URL. If you have the W3 Total Cache plugin installed, deactivate W3 Total Cache, try to Connect to WordPress.com again, reactivate W3 Total Cache, then clear W3 Total Cache's cache.
I use WP Super Cache ... uninstal and the problem continue!!
sorry for my inglish!!!