>In your "broken" setup, do you have libvirt and/or bridge-utils? > > >--Tim Tim, Yes it does. I think I am seeing the issue reported in a previous errata regarding Bugzilla Bug 237667 in RHEL for a now released fix in the current Xen rpm available. I have this exact behavior, and after many different installs on different machines, I finally saw a clean install done exactly the same work once and fail another. I emailed the assigned tech at rh about the bug and never heard back... Thanks, jlc