[CentOS] Unable to get software using Yum

[John R Pierce]

Jatin Davey wrote:
> http://centos.corenetworks.net/5.3/os/x86_64/repodata/repomd.xml: [Errno 
> 14] HTTP Error 404: Not Found
> ...

odd that its using /5.3/ in the path, it should be just /5/

try

    yum clean

then try again.