[Centos] yum broken

[ryanag at zoominternet.net (ryan)]

when I run yum update, I get:

Setting up Update Process
Setting up Repos
http://mirror.trouble-free.net/cAos/centos/4/os/i386/repodata/repomd.xml: 
[Errno 4] IOError: HTTP Error 404: Not Found
Trying other mirror.
Cannot open/read repomd.xml file for repository: base
failure: repodata/repomd.xml from base: [Errno 256] No more mirrors to 
try.


Any ideas? yum.log shows nothing interesting. I reinstalled the yum and 
yumconf rpm, and get the same message. up2date delivers a similar one 
also.