Jetpack operation timed out

I cannot register to jetpack because :
Error -> register_http_request_failed
Operation timed out after 30015 milliseconds with 0 bytes received

Anyone know have to handle this test result show “Self :Fail” ?
Test result :

TEST RESULTS:

HTTP: PASS
HTTPS: PASS
IDENTITY_CRISIS: PASS
SELF: FAIL

RAW TEST RESULTS:

HTTP
Array
(
[headers] => Array
(
[server] => nginx
[date] => Mon, 07 Apr 2014 17:35:59 GMT
[content-type] => text/plain;charset=utf-8
[connection] => close
[vary] => Cookie
[x-pingback] => http://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] =>
)

HTTPS
Array
(
[headers] => Array
(
[server] => nginx
[date] => Mon, 07 Apr 2014 17:36:00 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] =>
)

IDENTITY_CRISIS
PASS

SELF
Array
(
[headers] => Array
(
[server] => nginx
[date] => Mon, 07 Apr 2014 17:36:07 GMT
[content-type] => text/plain;charset=utf-8
[connection] => close
[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] => {"error":"Unknown Error","error_description":"An unknown error has occurred."}
[response] => Array
(
[code] => 400
[message] => Bad Request
)

[cookies] => Array
(
)

[filename] =>
)

https://wordpress.org/plugins/jetpack/