Jetpack could not connected to


I have JetPack Plugin and activate it for my own use only. But,
I've got this message when try to connect to

Error Details: The Jetpack server could not communicate with your site's XML-RPC URL. Please check to make sure is working properly. It should show 'XML?RPC server accepts POST requests only.' on a line by itself when viewed in a browser and should not have any blank links or extra output anywhere.

Are some of you who have experienced it and know how to solve it?