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However, S+ wouldn't work on "pam". After some sleuthing, I did "mountfsexportfs" and then "/etc/init.d/nfs restart" as root on "flux" followed by "mount /net/local" as root on "pam". (I'm not sure that "mountfsexportfs" was necessary.) I'm closer and "pam" can now find "/usr/local/bin/Splus7" (it couldn't before), but I still get an execution permission error. Obviously, I can (and did) ssh from pam to flux to run S+...