Hello!

On Mon, Jun 10, 2019 at 03:59:46PM -0400, Vadim Grinshpun via nginx wrote:

> After setting up nginx to run, I've noticed that 'lsof' shows all nginx
> processes (master + workers) listening on an ephemeral UDP port.
>
> nginx 25142   vgrinshp    4u  IPv4 422450236      0t0  UDP
> 127.0.0.1:33226
> nginx 25144   vgrinshp    4u  IPv4 422450236      0t0  UDP
> 127.0.0.1:33226
> nginx 25145   vgrinshp    4u  IPv4 422450236      0t0  UDP
> 127.0.0.1:33226
> nginx 25146   vgrinshp    4u  IPv4 422450236      0t0  UDP
> 127.0.0.1:33226
> nginx 25147   vgrinshp    4u  IPv4 422450236      0t0  UDP
> 127.0.0.1:33226
>
>
> I did not explicitly configure anything that (AFAIK) uses UDP, and I
> could not find anything in the doc that mentions any use of UDP ports by
> nginx.
> The ports seem to be used by nginx even with the most minimal nginx.conf.
>
> Does anyone here know how/why these ports are used?

By default nginx doesn't use any UDP ports. What's in your
config?

--
Maxim Dounin
http://mdounin.ru/
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