Estoy perdido!!!! 2 servidores SQL Server remotos

[torrente_xx]

$db_conexion= mssql_connect("83.36.54.252:3390", "user", "user") or die("No se pudo conectar a la Base de datos");
mssql_select_db("Northwind") or die(mssql_error());
$comm = mssql_query("SELECT * FROM Categories",$conn);

while($read = mssql_fetch_array($comm))

{
echo $read["CategoryName"];

}



mssql_close($conn);