To reword the question:

"upon connection" means there is 'something' listening on port 22. This 'something' (e.g. your server) already has to run beforehand (waiting for the actual connection and doing the authentication thing, as you yourself already stated).

Under which user shall this 'something' run? This could be a single non-privileged user account "mycoolservice" dedicated exclusively to that ssh daemon.

In reply to Re^5: SSH daemon in Perl? by soonix
in thread SSH daemon in Perl? by robs87

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