sqlsrv_query() expects parameter 1 to be resource, boolean given in

win2003 sp1
php_sqlsrv_52_ts_vc6.dll
php 5.28
SQL Server Native Client //安装了一百遍还它妈提示：连接sql server 2000提示 sqlsrv_query() expects parameter 1 to be resource, boolean given in 帮帮忙？？？？？？？？$connstr = array("Database"=>"yewuyuan","Uid"=>"sa","Pwd"=>"1234567890poiuytrewq","CharacterSet" => "UTF-8");
$conn = sqlsrv_connect('192.168,1.55,2433',$connstr);
if($conn==false) print_r(sqlsrv_errors(),true);
$sql = "SELECT TOP 10 * FROM a_keywords";
$data = sqlsrv_query($conn, $sql);
if($data)
{
    while($row = sqlsrv_fetch_array($data,SQLSRV_FETCH_ASSOC))
    {
        print_r($row);
    }
}
sqlsrv_close($conn);