[Nut-upsuser] NUT uses port 3493 for everything

Charles Lepple clepple at gmail.com
Thu Oct 29 01:49:11 GMT 2020

On Oct 24, 2020, at 3:20 PM, Roger Price <roger at rogerprice.org> wrote:
> The NUT project uses port 3493 to receive traffic to the upsd server. Unlike the protocols http (80) and https (443), NUT has no specific port for encrypted traffic.  For the upsdTLS.py daemon. I squatted port 563, but it would be much better to have an officially assigned port.
> Port 3494 was at one time assigned to
>  ibm3494            3494/tcp     # IBM 3494  [Jeffrey_Pilch]
>  ibm3494            3494/udp     # IBM 3494  [Jeffrey_Pilch]
> The IBM 3494 is a huge tape cartridge device.  Over 6000 cartridges at a time! It was announced 1995, withdrawn from marketing 2006 and service was discontinued 2018.
> I see that the port 3494 has disappeared from /etc/services in Debian 9.  Is it possible to aquire the port for NUT?

I think Russell Kroll registered port 3493 before I started using NUT. (If others have more information, please jump in.) My understanding is that TCP port assignments are handled by IANA:


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