I have a server running Debian 7 that exports an NFSv3 share, and a client running Centos 5 that accesses it. This works fine, except for one issue with permissions based on non-primary groups.
When I create a directory with 770 permissions on the server, a client user that belongs to the same group as the owner of the directory still can't access it if that group is not the user's primary group.
Any idea what the issue could be here? It works fine when the directory belongs to the primary group of the user, but not if it belongs to a secondary group.