solution (works for me):
add code below after $_COOKIE = array ();
if ( !isset( $HTTP_RAW_POST_DATA ) ) {
$HTTP_RAW_POST_DATA = file_get_contents( 'php://input' );
}
i found better solution, this was not cool with me:
xmlrpc.php, add below code after $_COOKIE = array();
if ( !isset( $HTTP_RAW_POST_DATA ) ) {
$HTTP_RAW_POST_DATA = file_get_contents( ‘php://input’ );
}