CentOS - Apr 2008 - Yum showing error

Hi
     I am using centos 5. yum saying following error..

[root at zeus Desktop]# yum grouplist
Loading "installonlyn" plugin
Setting up Group Process
Setting up repositories
Could not retrieve mirrorlist
http://mirrorlist.centos.org/?release=5&arch=i386&repo=os error was
[Errno 14] HTTP Error 407: Proxy Authentication Required
Error: Cannot find a valid baseurl for repo: base

my system is behind corporate filter. Is there any where to use yum.
help me out in this. in some forum it says we need NTLM to handle
this...

by
john


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On Fri, Apr 25, 2008 at 12:35:26PM +0530, JohnsonKoilraj
wrote:
> Hi
>      I am using centos 5. yum saying following error..
> 
> [root at zeus Desktop]# yum grouplist
> Loading "installonlyn" plugin
> Setting up Group Process
> Setting up repositories
> Could not retrieve mirrorlist
http://mirrorlist.centos.org/?release=5&arch=i386
> &repo=os error was
> [Errno 14] HTTP Error 407: Proxy Authentication Required
> Error: Cannot find a valid baseurl for repo: base
> 
> my system is behind corporate filter. Is there any where to use yum. help
me
> out in this. in some forum it says we need NTLM to handle this...
> 
> by
> john
> 
Sounds like you may need to do some proxy authentication.  Do a man
yum.conf and search for "proxy" and you should see a few parameters
that might help you out.  Throw these in /etc/yum.conf.

Ray