UDP requests with docker on Debain VPS

Oldies but goldies
1

Hi there,
I've a debian VPS that I don't manage to reach with UDP.

I deactivated the firewall.

When run this simple udp server `docker run -p 5678:5678/udp itstarting/go-simple-udp-server` :
- `nc -z -v -u localhost 5678` connects all right
- But if I try from outside `nc -z -v -u XX.XX.XX.XX 5678` the container is not reached.
- A similar TCP request is working (with a simple http server).

Is there something I need to do allow UDP on my VPS or maybe it's a docker setting to allow UDP from outside?

Thanks,

Adrien



What works :

2

I've a debian VPS that I don't manage


Please ask to the person who manages it.
3

Hi,
Very badly put on my part : "I've a debian VPS. I'm not able to reach it using UDP"

4

Hello,

without docker, does UDP work ?

Cordially, janus57

5

Good point. It doesn't seem to work either. I do
`nc -ul 2222`
it's not reachable even from its localhost (`nc -zvu locahost 222`)

A debian issue then?
(I'm out of my depth here, and appart from these netcat commands I didn't find much on th internet)