I have a Linux box in a corporate environment in which web access is gated through a proxy which requires authentication.
During a first run of cpan it auto configu
you need to provide absolute proxy URL address for configure CPAN proxy settings . don't worry instead of providing simply IP address and port number please provide as given below.
cpan> o conf init /proxy/
Your ftp_proxy? [] ftp://10.12.8.9:3128
Your http_proxy? [] http://10.12.8.9:3128
Your no_proxy? []
and provide username and password if needed (Make sure that you have the downloading permission )
I also have same the issue, but now its working for me. I should also work for you.
BR Jerry James