RHN down?

I'm currently unable to update my systems via yum.

yum update
Loaded plugins: product-id, refresh-packagekit, rhnplugin, search-disabled-repos, security, subscription-manager
There was an error communicating with RHN.
RHN channel support will be disabled.
rhn-plugin: Error communicating with server. The message was:
Proxy Error
Setting up Update Process
No Packages marked for Update