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I've run into this recently. Looks like you're running NFS version 4, which has additional security protocols and requires access map goodies to make it work (I've been meaning to look into the details, but have not had the chance; unfortunately, I've never been able to get idmapd working quite correctly). Try using NFS version 3 and see if that clears up the issue. To do so, you must add nfsvers=3 to the options in your automount configuration file to force version 3 (also be sure portmapper is running on both client and server). The big downside is that NFSv3 is quite a bit less secure than version 4 in terms of ID mapping. However, for a small network with only trusted clients it works well for me (which, I guess, is why I've never looked at all the bits and pieces necessary to get v4 working). YMMV.
Thank you for your quick reply - btmiller. I have solved this with single user and group by placing these values in mapping section for both server and client's idmapd.conf file. Now I am looking for bigger picture for multiple users.