Google Calendar Auth Problem

I try to authorize myself with google calender, I enabled Google calendar API, create OAuth tokens, everything is connecting until the step after I approve in Gmail, I get the following message:

WP_Error Object
(
    [errors] => Array
        (
            [http_request_failed] => Array
                (
                    [0] => cURL error 28: Connection timed out after 5000 milliseconds
                )

        )

    [error_data] => Array
        (
        )

)