Although, as I just realized, Steve Kuehn was just hypothesizing about the cause, so this may be completely the wrong track...
On Fri, Jan 8, 2021 at 8:54 AM Jeremy Weatherford <
jweather@...> wrote:
The issue is with listening on ports < 1024 (ie TCP servers).? Way back in the annals of Unix, someone decided that only root should be allowed to run services on ports < 1024 - this is what passed for a security model back when you could trust anyone who had root on any machine.? :)? Still an issue, but a little less likely to cause widespread problems since it doesn't affect TCP clients.
It's never been a problem to do this on 3-series that I'm aware of.? Is this is a new limitation for 4-series?? How on earth would you write a S+ module to use the most common IP control port ever, TelNet port 23 if so.? There is a ton of equipment that uses port 23 for IP control.? Will any module or program that needs to communicate to ports under 1024 not compile on 4-series?
--
Jason Mussetter
Control Systems Designer
Mussetter Programming Services
