Britgirl, as I know, “–redirect” option is only one way to force “user or ip” to choose certain node.
I think it will be nice if you could make fully “redirect and forget” mechanism and sessions will continue to work when Enterprise Server shuts down 😉
Because Enterprise Server “stays in the middle” of NX session in the current realisation and is a point of failure. Maybe clusterisation helps with it, but, as I understand, anyway all nx sessions will be disconnected when the cluster switch (or not?).
I speak about “fully redirect” mechanism, that redirects session on another NXSERVER and forgets about this session (will not stay in the middle): works as dispetcher-redirector only.