yum 出错

vison163

[root@mscdg048 ~]# yum list
Loading "rhnplugin" plugin
Loading "installonlyn" plugin
This system is not registered with RHN.
RHN support will be disabled.
Setting up repositories
Error: Cannot find a valid baseurl for repo: base

现在连添加／删除软件选项都打不开了，谢谢帮忙

pingz

好像是 repo 文件不对，不是 fedora 吧？
用的是 RHEL 吗？