PHP Socket is connected but does not read data - php

Question

$socket = socket_create(AF_INET, SOCK_DGRAM, 0);
socket_set_option($socket,SOL_SOCKET, SO_RCVTIMEO, array("sec"=>2, "usec"=>0));
$result = socket_connect($socket, $this->ip, $this->port);
if($result <= 0) {
echo "connect() failed.\nReason: ($result) \n";
}
$data = "\xFF\xFF\xFF\xFF\x54\x53\x6F\x75\x72\x63\x65\x20\x45\x6E\x67\x69\x6E\x65\x20\x51\x75\x65\x72\x79\x00";
socket_write($socket, $data, strlen($data));
$out = socket_read($socket, 4096);
socket_close($socket);
if($out == null ){
echo 'data null';
}
else {
$queryData = explode("\x00", substr($out, 6), 5);
$server['ip'] = $this->ip;
$server['port'] = $this->port;
$server['name'] = $queryData[0];
$server['map'] = $queryData[1];
$server['game'] = $queryData[2];
$server['description'] = $queryData[3];
$packet = $queryData[4];
//$app_id = array_pop(unpack("S", substr($packet, 0, 2)));
$server['players'] = ord(substr($packet, 2, 1));
$server['playersmax'] = ord(substr($packet, 3, 1));
$server['bots'] = ord(substr($packet, 4, 1));
$server['dedicated'] = substr($packet, 5, 1);
$server['os'] = substr($packet, 6, 1);
$server['password'] = ord(substr($packet, 7, 1));
$server['vac'] = ord(substr($packet, 8, 1));
$this->info = $server;
echo "<pre>";
print_r($queryData);
echo "</pre>";
}
//error_reporting($oldErrorReporting);
This code work on my old server (centos + php5 + apache2);
and after transfer to another server (ubuntu + php5 + apache2), it stopped working.
When The problem is not to set up php (it is on the socket support), but the fact that he simply does not receive a request, although no connection error, he betrays.
Among the possible reasons for thinking that the problem of accessing the service socket with external ip, but I did not know how to fix it.
Thanks in advance for your answers!