I have an NFS4-mounted /home drive, with several different users' home folders in it. I am using inetd's ID-mapping feature (i.e. NEED_IDMAPD=YES in /etc/default/nfs-common).
The NFS mount and ID-mapping seem to be working properly, because most user accounts can read and write files in their home drives. However, there are a few that get a "Permission denied" error when attempting to write to files in their home directory.
ls -lA shows that the permissions and ownership are as expected (i.e. /home/me is owned by me:me and has owner rxw permissions). The users in question are not part of any groups besides their own (i.e. if me can't write to /home/me/foo, then the output of groups me is me : me). I don't think that can be the problem, though, because there is at least one user who can write to their home dir and who is not a member of any other groups.
This may be related to this question, but that question makes it sound like the problem is with a particular client machine rather than a particular user account. (At the moment I am only working with a single client machine.)
