Yum has broken on 2 different fedora core 6 systems

I have fedora core 6 installed on two different systems, and I
now receive the errors below on both when attempting to run
yum from the command line. However, yumex is working OK.
My gut tells me yumex may have screwed up the repositories.
Has anyone else seem this issue? Any ideas how to fix?

-Thanks


mars:/home/fred> s yum check-update
Loading "installonlyn" plugin
Setting up repositories
http://rpm.livna.org/fedora/6/i386/repodata/repomd.xml: [Errno 4] IOError: <urlopen error (-2, 'Name or service not known')>
Trying other mirror.
http://livna.cat.pdx.edu/fedora/6/i386/repodata/repomd.xml: [Errno 4] IOError: <urlopen error (-2, 'Name or service not known')>
Trying other mirror.
http://wftp.tu-chemnitz.de/pub/linux/livna/fedora/6/i386/repodata/repomd.xml: [Errno 4] IOError: <urlopen error (-2, 'Name or service not known')>
Trying other mirror.
http://ftp-stud.fht-esslingen.de/pub/Mirrors/rpm.livna.org/fedora/6/i386/repodata/repomd.xml: [Errno 4] IOError: <urlopen error (-2, 'Name or service not known')>
Trying other mirror.
http://mirror.atrpms.net/livna/fedora/6/i386/repodata/repomd.xml: [Errno 4] IOError: <urlopen error (-2, 'Name or service not known')>
Trying other mirror.
ftp://mirrors.tummy.com/pub/rpm.livna.org/fedora/6/i386/repodata/repomd.xml: [Errno 4] IOError: <urlopen error (-2, 'Name or service not known')>
Trying other mirror.
Error: Cannot open/read repomd.xml file for repository: livna


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