Hi choroba, thanks for reply! Here is the o conf /proxy/ results. 
cpan[5]> o conf /proxy/
$CPAN::Config options from /home/zluna/.cpan/CPAN/MyConfig.pm:

    ftp_proxy          []
    http_proxy         []
    no_proxy           [localhost,127.0.0.0/8,::1]
    proxy_pass         undef
    proxy_user         []

cpan[7]> i
Fetching with LWP:
http://mirrors.163.com/cpan/authors/01mailrc.txt.gz
LWP failed with code[500] message[read timeout]

Proxy authentication needed!
 (Note: to permanently configure username and password run
   o conf proxy_user your_username
   o conf proxy_pass your_password
     )

[download]
In my opinin, I did not set any proxy and I also don't want to use proxy for download modules. But still can not install the modules, however, I can download the modules by "wget" and then put them to the folders.

In reply to Re^2: I can not install perl modules via LWP by i19870503
in thread I can not install perl modules via LWP by i19870503

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