error: site_inaccessible, IXR -32300
lighttpd 1.4.28, WordPress 3.4.2–ja, Jetpack 1.9.2, Core Control 1.1

http://techdevian.com/jetpack-error-failed-authenticate-resolved-fix/

1. Core Control Plugin
2. Tool -> Core Control -> HTTP Access Module 1.0 -> Save Module Choices
3. External HTTP Access
4. Manage Transports -> cURL Transport -> Disable Transport

http://en.forums.wordpress.com/topic/jetpack-instl-issue-with-ssl-and-lighttpd?replies=18
/etc/lighttpd/lighttpd.conf
url.rewrite-once = (
"^/en//(.*)\.(.+)$" => "$0",
"^/en/(wp-.+)$" => "$0",
"^/en/xmlrpc.php(.*)?" => "$0",
"^/en/sitemap.xml" => "$0",
"^/en/(.+)/?$" => "/en/index.php/$1",
"^/ja//(.*)\.(.+)$" => "$0",
"^/ja/(wp-.+)$" => "$0",
"^/ja/xmlrpc.php(.*)?" => "$0",
"^/ja/sitemap.xml" => "$0",
"^/ja/(.+)/?$" => "/ja/index.php/$1"
)


We can confirm by http://userwordpressdomain/yourwordpressdirectory/xmlrpc.php?rsd