In case google brought you this way because you couldn’t get your darwinports perl installation to install packages with Net:FTP, here is a possible reason.
I was trying to sudo cpan / install XML:XML2JSON, and cpan would always get stuck with displaying “Fetching with Net::FTP:”… without actually downloading anything.
Here is the simple trick:
cd /opt/local/lib/perl5/5.X.X/Net libnetcfg -c
and then answer
Should all FTP connections be passive (y|n) ? [no]
with “yes”.
Panyasan's Random Musings 
Hi
It didn’t work for me, altrough I have managed to fix this problem by doing:
export FTP_PASSIVE=1
Hope it helps!
Kamil