[CentOS] Yum errors on a new install

Hi all;

I'm getting this the first time I try and run yum update on a new install of CentOS 5.4 (x86_64):

Error: requested datatype primary not available

My internet connection is working a 'yum clean all' does not help

[root@localhost ~]# yum clean all Loaded plugins: fastestmirror Cleaning up Everything Cleaning up list of fastest mirrors

[root@localhost ~]# yum update Loaded plugins: fastestmirror Determining fastest mirrors * addons: mirror.fdcservers.net * base: mirror.fdcservers.net * extras: mirrors.serveraxis.net * updates: mirrors.bluehost.com addons | 509 B 00:00 Error: requested datatype primary not available

thoughts?

thanks in advance...