Hello,

You didn't actually mention on which operating system this is being run, so to see the environmental variables of the user running the script:

Unix/Linux
at the command line type: env or env | grep FTP_FIREWALL


Windows
on the command line type: set


The Net::FTP documentation state this:
"OPTIONS" are passed in a hash like fashion, using key and value pairs.


So...

use warnings;
use strict;
use Net::FTP;
my $ftp=Net::FTP->new(Host => "ftp.cpan.org", Firewall => "XXXX")
        or die "Couldnt connect:$@\n";
$ftp->login("anonymous");
$ftp->cwd("/pub/CPAN");
$ftp->get("README.html");
$ftp->close;
[download]

That's how I understand the documention at least... :-)

regexes