[CentOS] can NOT update CENTOS use YUM

[Robert]

mcclnx mcc wrote:
> Thanks. for answer.  I tried:
>
>   yum clean all
>   yum update
>
> It still same problem.
>   
<snip>

>>> Could not retrieve mirrorlist http://mirrorlist.centos.org/?release=5&arch=i386&repo=os
>>>       
<snip>

This might be a stupid question but can you paste that URL into a 
browser and
see the list of mirrors?
I see:

http://mirror.steadfast.net/centos/5.3/os/i386/
http://centos.promopeddler.com/5.3/os/i386/
ftp://repo.genomics.upenn.edu/centos/5.3/os/i386/
http://mirror.unl.edu/centos/5.3/os/i386/
http://mirror.web-ster.com/centos/5.3/os/i386/
http://mirrors.liquidweb.com/CentOS/5.3/os/i386/
http://centos.omnispring.com/5.3/os/i386/
http://mirrors.unbornmedia.com/centos/5.3/os/i386/
http://mirror.stanford.edu/yum/pub/centos/5.3/os/i386/
http://mirrors.adams.net/centos/5.3/os/i386/

in my browser.