On my net the same users have different numeric IDs on different machines. 
While id mapping takes care of this for the file ownership attribute, it won't 
work for user authentication for sec=sys mounted systems as I had hoped. So 
even though the files get displayed with correct user names on both ends, the 
server may think you a different person, most probably "nobody". I found out 
about this in mail archives:
http://thread.gmane.org/gmane.linux.nfsv4/466
http://thread.gmane.org/gmane.linux.nfsv4/7103/focus=7105

On the whole, this issue seems to be a whishlist item for NFS (v5?), but
not an actual bug in Ubuntu. I have to say that the complete lack of a
comprehensive error message makes it quite difficult to understand,
though.

-- 
idmapping with nfs4 mounts not working in feisty
https://bugs.launchpad.net/bugs/106401
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