I have code like this:

$conn = ftp_connect($ftp_server);
if (!conn) exit();
if (!ftp_login($conn, 'anonymous', '')) exit();
$ls = ftp_nlist($conn, '/');
$rls = ftp_rawlist($conn, '/');
var_dump($ls);
var_dump($rls);

I have tested this trying to connect to two different IIS 5.0 FTP servers, and I always get "bool(false)bool(false)" as output.
Into my php.ini there's nothing rare about ftp; just allow_url_fopen = On.
Before I upgrade PHP to PHP 4.0.6, I was doing some tests with FTP functions and ftp_nlist as well as ftp_rawlist was working fine.

Manu.