I'm having a serious issue with ldap_connect. I have another server on which this code works, but it's a Windows box.

PHP script (ad_test.php):
Code:
$ad_server = "fqdn.ad.forest";
$ds_port = 389;
$ad_conn = ldap_connect($ad_server, $ds_port); 
echo ldap_errno($ad_conn) . ' : ' . ldap_error($ad_conn) . "\n";
var_dump($ad_conn);
Output:
PHP Warning: ldap_errno():...