What does NFS getattr failed/RPC: Authentication error mean?

        You are probably running a pre-4.0 version of NFS and your
        username is in more than 8 groups.  There is a limit on the
        number of groups that could be represented in the rpc service
        (called NGRPS).  On pre-4.0 systems this was 8, now it is 16.
        Since many vendors other than Sun are still running old versions
        of NFS, you might see this error even if your SunOS is recent.

        Authentication errors are also caused by having secure RPC
        enabled on the client but not on the server, or by having a
        misconfigured secure RPC configuration for the user name
        generating the errors.  Beware of this problem when you are
        using the automounter, as programs (such as Sendmail) may
        silently fail when when they try to mount a directory
        and get this error.

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