ปัญหา connection rejected by remote interface firebird ครับ php + firebird

<?php
	//$host 	= "localhost:D:\FB_DB_Data\TEST.FDB";
	$host 	= "10.4.2.68:D:\FB_DB_Data\TEST.FDB";
	echo $host ."<br>";
	$db 	= ibase_connect($host,'SYSDBA','masterkey') 
			  or die('error connect');
		  
	$sql 	= "SELECT * FROM EMPLOYEE ";
	$query	= ibase_query($db,$sql);
?>
.....
<table border="1" width="80%" cellspacing="0">
<thead>
	<th>EMP-ID</th>
	<th>Name></th>
	<th>L-Name></th>
</thead>
<tbody>
<?
	while($row = ibase_fetch_object($query))
	{
?>
		<tr>
			<td><?= $row -> EMP_ID ?></td>
			<td>&nbsp;<?= $row->EMP_NAME ?></td>
			<td>&nbsp;<?= $row->EMP_LNAME ?></td>
		</tr>
<?	}
?>
</tbody>
</table>