When the node is running with insufficient priveleges, it starts up but does not bind to the listening port. And therefore, cannot hear any messages sent to it.
Reported by Finastra.
For example, when the node is installed as "root" user, and then startup by "corda", the node will start and update the log file, however, it fails to listen to the Port correctly, and isn't functioning properly. However, the user does not know that this is an issue - as the node appears to run normally.
it would be expected that the node didn't start at all
or at least start and crash
instead.. it keeps running, giving the impression that everything is ok