After I kindly got a solution to a Net::FTP problem I got, I could move to the next one :))
Considering this code: 
...
my $ftp = Net::FTP->new($hostname, Debug => 1, Passive => 1);
$ftp->login($user,$password);
$ftp->cwd($directory);
my $ref= $ftp->ls();
die Dumper($ref);

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If the $directory is empty, on Linux I get: 
Can't use an undefined value as a symbol reference at /usr/lib/perl5/5
+.8.8/Net/FTP/dataconn.pm line 53.

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Instead on Windows I get correctly: 
$VAR1 = undef;

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How could I fix this behaviour on Linux ? Thanks for any hint/explaination.

In reply to Net::FTP behavior under Linux and Windows by rbi

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