Подключение плагина Jetpack

@perdyllo стоит Wordfence и Clearfy, но при их отключение проблема не решается

@fierevere Ваш сайт не может обмениваться данными с Jetpack!

SELF:
							Array
(
    [headers] => Requests_Utility_CaseInsensitiveDictionary Object
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            [data:protected] => Array
                (
                    [server] => nginx
                    [date] => Thu, 14 Dec 2017 12:39:08 GMT
                    [content-type] => text/plain;charset=utf-8
                    [expires] => Wed, 11 Jan 1984 05:00:00 GMT
                    [cache-control] => no-cache, must-revalidate, max-age=60
                    [x-hacker] => Jetpack Test
                    [x-ac] => 3.fra _dfw
                    [strict-transport-security] => max-age=15552000
                )

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    [body] => {"error":"XML-RPC is not responding correctly ( 200 )","error_description":"It looks like XML-RPC is not responding correctly. Please make sure XML-RPC is turned on for your site and is set up to respond to all content types. You can test this yourself by running the following command from the command line:<blockquote><code>curl -A 'Jetpack by WordPress.com' -d '<methodCall><methodName>demo.sayHello<\/methodName><\/methodCall>' http:\/\/intro4u.ru\/xmlrpc.php<\/code><\/blockquote><p>The answer should be:<\/p><blockquote><code><pre><?xml version="1.0" encoding="UTF-8"?>\n<methodResponse>\n  <params>\n    <param>\n      <value>\n      <string>Hello!<\/string>\n      <\/value>\n    <\/param>\n  <\/params>\n<\/methodResponse><\/pre><\/code><\/blockquote>"}
    [response] => Array
        (
            [code] => 400
            [message] => Bad Request
        )

    [cookies] => Array
        (
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    [filename] => 
    [http_response] => WP_HTTP_Requests_Response Object
        (
            [response:protected] => Requests_Response Object
                (
                    [body] => {"error":"XML-RPC is not responding correctly ( 200 )","error_description":"It looks like XML-RPC is not responding correctly. Please make sure XML-RPC is turned on for your site and is set up to respond to all content types. You can test this yourself by running the following command from the command line:<blockquote><code>curl -A 'Jetpack by WordPress.com' -d '<methodCall><methodName>demo.sayHello<\/methodName><\/methodCall>' http:\/\/intro4u.ru\/xmlrpc.php<\/code><\/blockquote><p>The answer should be:<\/p><blockquote><code><pre><?xml version="1.0" encoding="UTF-8"?>\n<methodResponse>\n  <params>\n    <param>\n      <value>\n      <string>Hello!<\/string>\n      <\/value>\n    <\/param>\n  <\/params>\n<\/methodResponse><\/pre><\/code><\/blockquote>"}
                    [raw] => HTTP/1.1 400 Bad Request
Server: nginx
Date: Thu, 14 Dec 2017 12:39:08 GMT
Content-Type: text/plain;charset=utf-8
Transfer-Encoding: chunked
Connection: close
Expires: Wed, 11 Jan 1984 05:00:00 GMT
Cache-Control: no-cache, must-revalidate, max-age=60
X-hacker: Jetpack Test
X-ac: 3.fra _dfw
Strict-Transport-Security: max-age=15552000

{"error":"XML-RPC is not responding correctly ( 200 )","error_description":"It looks like XML-RPC is not responding correctly. Please make sure XML-RPC is turned on for your site and is set up to respond to all content types. You can test this yourself by running the following command from the command line:<blockquote><code>curl -A 'Jetpack by WordPress.com' -d '<methodCall><methodName>demo.sayHello<\/methodName><\/methodCall>' http:\/\/intro4u.ru\/xmlrpc.php<\/code><\/blockquote><p>The answer should be:<\/p><blockquote><code><pre><?xml version="1.0" encoding="UTF-8"?>\n<methodResponse>\n  <params>\n    <param>\n      <value>\n      <string>Hello!<\/string>\n      <\/value>\n    <\/param>\n  <\/params>\n<\/methodResponse><\/pre><\/code><\/blockquote>"}
                    [headers] => Requests_Response_Headers Object
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                                    [server] => Array
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                                            [0] => nginx
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                                    [date] => Array
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                                            [0] => Thu, 14 Dec 2017 12:39:08 GMT
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                                    [content-type] => Array
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                                    [expires] => Array
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                                            [0] => Wed, 11 Jan 1984 05:00:00 GMT
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                                    [cache-control] => Array
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                                    [x-hacker] => Array
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                                            [0] => Jetpack Test
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                                    [x-ac] => Array
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                                            [0] => 3.fra _dfw
                                        )

                                    [strict-transport-security] => Array
                                        (
                                            [0] => max-age=15552000
                                        )

                                )

                        )

                    [status_code] => 400
                    [protocol_version] => 1.1
                    [success] => 
                    [redirects] => 0
                    [url] => https://jetpack.wordpress.com/jetpack.testsite/1/?url=http://intro4u.ru/xmlrpc.php
                    [history] => Array
                        (
                        )

                    [cookies] => Requests_Cookie_Jar Object
                        (
                            [cookies:protected] => Array
                                (
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                        )

                )

            [filename:protected] => 
            [data] => 
            [headers] => 
            [status] => 
        )

)

плагины — деактивация всех плагинов с очисткой кеша не помогает
хостер — пишет, что проблема не в них
.htaccess — очищал код, тоже не помогло

Написал в их службу поддержи, никто не ответил. Хотя тоже помню, что раньше они быстро отвечали и очень любезно даже:)) Написал на форум плагина Jetpack, так как все способы, что есть в интернете перепробовал.