The problem is due to libvirt using mount.nfs instead of mount.nfs4 for NFSv4 shares. virt-manager tries the following command (see attached file): [jon@jon-laptop ~]$ sudo /bin/mount 10.0.0.2:/libvirt_install /var/lib/libvirt/images/server-install mount.nfs: access denied by server while mounting 10.0.0.2:/libvirt_install When it should be something like this instead: [jon@jon-laptop ~]$ sudo /bin/mount -t nfs4 10.0.0.2:/libvirt_install /var/lib/libvirt/images/server-install Because mount apparently considers NFSv4 to be a different type than previous NFS versions: [jon@jon-laptop ~]$ mount.nfs mount.nfs mount.nfs4 OS: Arch Linux Current on both server and client. nfs-utils 1.2.0-4 and kernel 2.6.31 I don't believe there is a good way to programatically check which version a share is, but one can catch the error and try again with "-t nfs4". Or perhaps trying nfs4 first is better...

> libvirtError: internal error '/bin/mount 10.0.0.2:/libvirt_install