[Spacewalk-list] failed to retrieve repodata/repomd.xml

[Matthew Madey]

When running a yum -y update against a Fedora 20 client, I'm getting the
below error:

 One of the configured repositories failed (Unknown),
 and yum doesn't have enough cached data to continue. At this point the only
 safe thing yum can do is fail.

failed to retrieve repodata/repomd.xml from fedora20-base-x86_64-updates
error was [Errno 14] HTTPS Error 404 - Not Found

The client is subscribed to 2 child channels, and only the "updates"
channel is causing the issue. Another Fedora 20 client configured the same
way can download the repodata just fine.
I don't have any .repo files in /etc/yum.repos.d/.. Here's what I've
already tried thus far:

On client
- yum clean all
- rm -Rf /var/cache/yum/*
- Re-registering with Spacewalk
- Compared rhn-plugin and other yum packages with working client, no
differences in versions
- Copying repodata from working client to affected client
- Disabling iptables
- Disabling SSL in /etc/sysconfig/rhn/up2date

On Spacewalk server
- rm -Rf /var/cache/rhn ; service taskomatic restart (waited a full day to
allow for metadata regeneration)
- Unsubscribing and re-subscribing the client to the affected channel
- tailing /var/log/httpd/error_log (surprisingly no errors)

Right now I'm going back to the standard repo's and bypassing Spacewalk for
this client to update, then I'll try again and see if I can get this
working. Anyone have ideas as to what could be wrong?
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