Client answered to 
<?xml version="1.0" encoding="UTF-8" ?>
<doc>
    <gateway>
      <name>ubiz.ru</name>
      <path>/home/ubiz.ru/htdocs/kaqoo/rss.php</path>
      <url_path>/kaqoo/rss.php</url_path>
      <remote>38.107.179.233</remote>
   </gateway>
<context>
<site_id>7</site_id>
<site_password>f472f7f302fef40f599b5b2d4c8fffe8</site_password>
<lang>en_us</lang><tz>CEST</tz></context>

  <request>
    <request_type>list</request_type>
    <column> ping</column>
<ServerFunction>
<name>ping</name>
<parameters>
</parameters>
</ServerFunction>
  </request>
</doc>
by
HTTP/1.1 502 Bad Gateway
Server: nginx/0.7.67
Date: Sun, 20 May 2012 00:45:58 GMT
Content-Type: text/html
Content-Length: 173
Connection: close

<html>
<head><title>502 Bad Gateway</title></head>
<body bgcolor="white">
<center><h1>502 Bad Gateway</h1></center>
<hr><center>nginx/0.7.67</center>
</body>
</html>

Notice: Use of undefined constant K2_ONE_BLOCK - assumed 'K2_ONE_BLOCK' in /home/ubiz.ru/htdocs/kaqoo/data/footer.inc.php on line 1
©/Kaqoo / 1 request(s) in 21.1915898323 / server db: 0 request(s) in 0 / server time: 01:00 / local time: 02:45 / deflated: / inflated:


Notice: ob_end_clean() [ref.outcontrol]: failed to delete buffer. No buffer to delete. in /home/ubiz.ru/htdocs/kaqoo/include/init.inc.php on line 111

Notice: Use of undefined constant MAIN_META_AUTHOR - assumed 'MAIN_META_AUTHOR' in /home/ubiz.ru/htdocs/kaqoo/include/design/common_header.design.inc.php on line 52
MAIN_META_AUTHOR