# Requesting help on learning Docker

**URL:** <https://forums.docker.com/t/requesting-help-on-learning-docker/109213>\
**Category:** Docker Desktop\
**Created:** [May 18, 2021, 2:59am UTC](https://forums.docker.com/t/requesting-help-on-learning-docker/109213 "2021-05-18T02:59:54Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![legocoin](https://avatars.discourse-cdn.com/v4/letter/l/dec6dc/32.png) [@legocoin](https://forums.docker.com/u/legocoin)\
**Post date:** [May 18, 2021, 2:59am UTC](https://forums.docker.com/t/requesting-help-on-learning-docker/109213/1 "2021-05-18T02:59:54Z")

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Hi All,

I am new and learning docker. Below is what I am trying with ports, and need some help understanding what I am doing wrong. I am using Docker Desktop on Windows 10 and Command Prompt

I am not able to get UDP working. Previously I was able to get working with dynamic port in and out.

Server Command  
docker run --rm -ti -p 45678/udp --name echo-server ubuntu:14.04 bash

Cmd promt  
docker port echo-server  
45678/udp → 0.0.0.0:57033

Server Command  
nc -ulp 57033

These are the 3 options I tried

Option 1 Client: - Failed nc not recognized command  
nc host.docker.internal 57033

Option 2 Client: - Failed nc not recognized command  
nc localhost 57033

Option 3 Client: - With out using UDP I was able to use the below. No when I run this it stays open only for a few sec for entry and it doesn’t post to server.

docker run --rm -ti ubuntu:14.04 bash  
nc host.docker.internal 57033

After I type something in a few seconds later it comes back to same command line inside the container it typed it in.

root@431a77e7ff82:/# nc host.docker.internal 57033  
test  
root@431a77e7ff82:/# test

I am expecting “test” to have shown up on the server container but nothing showed up  
C:\WINDOWS\system32\>docker run --rm -ti -p 45678/udp --name echo-server ubuntu:14.04 bash  
root@90dfc2817cb6:/# nc -ulp 57033

Thank you much for any help.