Jetpack could not contact WordPress.com: register_http_request_failed.

The dashboard gives this error message when trying to connect Jetpack to wordpress.com

Jetpack could not contact WordPress.com: register_http_request_failed. This usually means something is incorrectly configured on your web host. Operation timed out after 15000 milliseconds with 0 bytes received

Jetpack Compatibility Test

Site info

SITE_URL: https://goo.gl/QWsnMc
HOME_URL: https://goo.gl/QWsnMc

TEST: HTTP Connection

Array
(
    [headers] => Array
        (
            [server] => nginx
            [date] => Fri, 09 May 2014 19:27:50 GMT
            [content-type] => text/plain;charset=utf-8
            [connection] => close
            [vary] => Cookie
            [x-pingback] => https://jetpack.wordpress.com/xmlrpc.php
            [expires] => Wed, 11 Jan 1984 05:00:00 GMT
            [cache-control] => no-cache, must-revalidate, max-age=60
            [pragma] => no-cache
            [x-hacker] => Jetpack Test
        )

    [body] => OK
    [response] => Array
        (
            [code] => 200
            [message] => OK
        )

    [cookies] => Array
        (
        )

    [filename] =>
)

TEST: HTTPS Connection
Array
(
    [headers] => Array
        (
            [server] => nginx
            [date] => Fri, 09 May 2014 19:27:51 GMT
            [content-type] => text/plain;charset=utf-8
            [connection] => close
            [vary] => Cookie
            [x-pingback] => https://jetpack.wordpress.com/xmlrpc.php
            [expires] => Wed, 11 Jan 1984 05:00:00 GMT
            [cache-control] => no-cache, must-revalidate, max-age=60
            [pragma] => no-cache
            [x-hacker] => Jetpack Test
        )

    [body] => OK
    [response] => Array
        (
            [code] => 200
            [message] => OK
        )

    [cookies] => Array
        (
        )

    [filename] =>
)

TEST: Self Connection
Array
(
    [headers] => Array
        (
            [date] => Fri, 09 May 2014 19:27:51 GMT
            [server] => Apache
            [x-powered-by] => PHP/5.2.17
            [vary] => User-Agent,Accept-Encoding
            [connection] => close
            [content-type] => text/plain
        )

    [body] => XML-RPC server accepts POST requests only.
    [response] => Array
        (
            [code] => 200
            [message] => OK
        )

    [cookies] => Array
        (
        )

    [filename] =>
)