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http://mandarapte.com/tutorials/fix-wordpress-com-jetpack-error-called-website-publicly-accessible-jetpack-site_inaccessible-error-details-jetpack-server-unable-communicate-site-http-404-web-host-connections-wordpress-com/
How to fix WordPress.com Jetpack error called Your website needs to be publicly accessible to use Jetpack: site_inaccessible. Error Details: The Jetpack server was unable to communicate with your site [HTTP 404]. Ask your web host if they allow connections from WordPress.com