While I was changing my nfs server from NFSv3 to NFSv4 I've found our user mapping broken. Before idmapd gets started we need to make sure nfsd module is loaded. If the module is not loaded all files are mapped to nobody the guest account. We load it in the nfs-common init script now. This is also done the same way by Debian, Fedora and Gentoo. see http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=490181 https://bugs.launchpad.net/ubuntu/+source/nfs-utils/+bug/235930 http://cvs.fedoraproject.org/viewvc/rpms/nfs-utils/F-13/nfs.init?revision=1.35&view=markup Now it's working on my server. Please signoff. -Andy