apache — php whois перестал работать на другом сервере

Я использую этот класс whois, он отлично работает на одном сервере, но не работает должным образом на другом сервере с той же версией PHP 5.4, на первом сервере он правильно возвращает статус доменного имени, а на другом возвращает просто один статус: «доменное имя не доступно», в то время как доменное имя действительно доступно.

<?
class Whois_domain {

var $possible_tlds;
var $whois_server;
var $free_string;
var $whois_param;
var $domain;
var $tld;
var $compl_domain;
var $full_info;
var $msg;
var $info;
var $os_system = "linux"; // switch between "linux" and "win"
function Whois_domain() {
$this->info = "";
$this->msg = "";
}
function process() {
if ($this->create_domain()) {
if ($this->full_info == "yes") {
$this->get_domain_info();
} else {
if ($this->check_only() == 1) {
$this->msg = "The domain name: <b>".$this->compl_domain."</b> is free.";
return true;
} elseif ($this->check_only() == 0) {
$this->msg = "The domain name: <b>".$this->compl_domain."</b> is not available";
return false;
} else {
$this->msg = "There was something wrong, try it again.";
}
}
} else {
$this->msg = "Only letters, numbers and hyphens (-) are valid!";
}
}
function check_entry() {
if (preg_match("/^([a-z0-9]+(\-?[a-z0-9]*)){2,63}$/i", $this->domain)) {
return true;
} else {
return false;
}
}
function create_tld_select() {
$menu = "<select name=\"tld\" style=\"margin-left:0;\">\n";
foreach ($this->possible_tlds as $val) {
$menu .= "  <option value=\"".$val."\"";
$menu .= (isset($_POST['tld']) && $_POST['tld'] == $val) ? " selected=\"selected\">" : ">";
$menu .= $val."</option>\n";
}
$menu .= "</select>\n";
return $menu;
}
function create_domain() {
if ($this->check_entry()) {
$this->domain = strtolower($this->domain);
$this->compl_domain = $this->domain.".".$this->tld;
return true;
} else {
return false;
}
}
function check_only() {
$data = $this->get_whois_data();
if (is_array($data)) {
$found = 0;
foreach ($data as $val) {
if (eregi($this->free_string, $val)) {
$found = 1;
}
}
return $found;
} else {
$this->msg = "Error, please try it again.";
}
}
function get_domain_info() {
if ($this->create_domain()) {
$data = ($this->tld == "nl") ? $this->get_whois_data(true) : $this->get_whois_data();
if (is_array($data)) {
foreach ($data as $val) {
if (eregi($this->free_string, $val)) {
$this->msg = "The domain name: <b>".$this->compl_domain."</b> is free.";
$this->info = "";
break;
}
$this->info .= $val;
}
} else {
$this->msg = "Error, please try it again.";
}
} else {
$this->msg = "Only letters, numbers and hyphens (-) are valid!";
}
}
function get_whois_data($empty_param = false) {
// the parameter is new since version 1.20 and is used for .nl (dutch) domains only
if ($empty_param) {
$this->whois_param = "";
}
if ($this->tld == "de") $this->os_system = "win"; // this tld must be queried with fsock otherwise it will not work
if ($this->os_system == "win") {
$connection = @fsockopen($this->whois_server, 43);
if (!$connection) {
unset($connection);
$this->msg = "Can't connect to the server!";
return;
} else {
sleep(2);
fputs($connection, $this->whois_param.$this->compl_domain."\r\n");
while (!feof($connection)) {
$buffer[] = fgets($connection, 4096);
}
fclose($connection);
}
} else {
$string = "whois -h ".$this->whois_server." \"".$this->whois_param.$this->compl_domain."\"";
$string = str_replace (";", "", $string).";";
exec($string, $buffer);
}
if (isset($buffer)) {
//print_r($buffer);
return $buffer;
} else {
$this->msg = "Can't retrieve data from the server!";
}
}
}
?>

Я изменил права доступа к файлам и версии php на другом сервере, но все так же.