Your admin might need to run: 

$ cpan -l

[download]
to get a listing of what is on the system.

See also: https://stackoverflow.com/questions/115425/how-do-i-get-a-list-of-installed-cpan-modules

I am not seeing much on the CPAN testers site related to this bug. But I hope with some info we can solve it http://www.cpantesters.org/distro/A/App-perlbrew.html

In reply to Re^10: perlbrew/curl: curl: (60) Peer certificate cannot be authenticated with known CA certificates by thechartist
in thread [SOLVED]: perlbrew/curl: curl: (60) Peer certificate cannot be authenticated with known CA certificates by Perl300

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