There is an ongoing outage on the primary CPAN mirror. It is possible to work around the issue by using MetaCPAN as a mirror.

20110914
  - Remove "untrusted" certificates (RT#70967, Thomas Hoger)

20110904
  - Remove and distrust DigiNotar
  - Add Certinomis, Root CA Generalitat Valenciana, A-Trust-nQual-03 and TWCA