Today while trying to run yum update for one of our server we got the following error.

yum update
Loaded plugins: fastestmirror
Loading mirror speeds from cached hostfile
* addons: mirror.bytemark.co.uk
* atomic: www5.atomicorp.com
* base: mirror.sov.uk.goscomb.net
* extras: mirror.sov.uk.goscomb.net
* updates: mirror.sov.uk.goscomb.net

http://www4.atomicorp.com/channels/plesk/9.0/centos/5/i386/repodata/repomd.xml: [Errno 14] HTTP Error 404: Not Found

Solution:

To fix this we logged into the server and from /etc/yum.repos.d/ delete the plesk.repo and run the yum updater again.  Please make sure if you are primarly using atomic corps repo.