How do I fix a problem with socket connections?

Question

PHP

$socket = socket_create(AF_INET, SOCK_DGRAM, 0);
            socket_set_option($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>";
                    }

This piece of code worked perfectly on my old server (centos + php5 + apache2);
But after migrating to a new one (ubuntu + php5 + apache2), it began to behave very strangely.

Through sockets, it seems like there is a connection to the server (no warnings, no errors), but in response to the request, it does not receive anything.

There is a feeling that he simply cannot connect to external servers. But I don't know how to fix it.

Socket support in php is enabled.

Thanks in advance for your replies!