[root@kw156 ~]# yum update
Loading "rhnplugin" plugin
Loading "installonlyn" plugin
There was an error communicating with RHN.
RHN support will be disabled.
Error communicating with server. The message was:
timed out
Setting up Update Process
Setting up repositories
No Repositories Available to Set Up
Reading repository metadata in from local files
No Packages marked for Update/Obsoletion