CPAN is failing to fetch any file, as below:

  I'm trying to fetch one
CPAN: LWP::UserAgent loaded ok
Fetching with LWP:
  ftp://cpan.etla.org/pub/CPAN/MIRRORED.BY
Fetching with LWP:
  ftp://cpan.etla.org/pub/CPAN/MIRRORED.BY.gz
Fetching with Net::FTP:
  ftp://cpan.etla.org/pub/CPAN/MIRRORED.BY
Couldn't fetch MIRRORED.BY from cpan.etla.org
Fetching with Net::FTP
  ftp://cpan.etla.org/pub/CPAN/MIRRORED.BY.gz
Couldn't fetch MIRRORED.BY.gz from cpan.etla.org
Fetching with LWP:
  ftp://cpan.teleglobe.net/pub/CPAN/MIRRORED.BY
Useless content call in void context at /Library/Perl/5.8.1/LWP/Protoc
+ol/ftp.pm line 398
Fetching with LWP:
  ftp://cpan.teleglobe.net/pub/CPAN/MIRRORED.BY.gz
Fetching with Net::FTP:
  ftp://cpan.teleglobe.net/pub/CPAN/MIRRORED.BY
Couldn't fetch MIRRORED.BY from cpan.teleglobe.net
Fetching with Net::FTP
[download]

I can download files using external programs such as wget and ftp, so the network is not a problem. I have installed a latest copy of cpan, how the same problem exists.