Thanks.... That worked for me..
> I understand that its a "proxy" problem (because its working fine without
> any proxy connection network). But not able to figure it out.
> I set env variable http_proxy, https_proxy, ftp_proxy, no_proxy.
> I also defined yum http_proxy, https_proxy, ftp_proxy and wgetrc http_proxy,
> https_proxy, ftp_proxy.
If you need proxy only for yum, you can set it in yum configuration
(see man yum.conf) and leave env vars clean.
Cheers,
Alan