Can't access docker inside VM

Hello, 
I am new and have installed an Unraid 6.12.5 server on 192.168.80.100 (with a nginx manager container and a pihole container). On it, I have created a VM with Debian. The network configuration is br0 that give it an IP 192.168.80.4.

On the Debian VM, I have Nginx that uses a local DNS (thanks pihole) to redirect space.local (no https) to 127.0.0.1:8084 that is a container for jetbrains space on-promise. 

Inside the VM, I can access  of the webgui using space.local, so the Nginx works and the container too. 

But If I try to access it from my local network, it fail with a ERR_CONNECTION_TIMED_OUT (This site can’t be reached)

To answer some questions :

When I installed debian first, I could use Nomachine. After installing docker and nginx, I can't use it anymore. I try to recreate a debian to check which one could cause that, but after installing docker, Nomachineopen then close after 1 seconde. But with RealVnc it works great.

I can ping the VM from the network from a Linux computer (on Windows, I tried too add a rule on the firewall, I could ping another machine on the network but not the VM). 

I cant' install the docker-compose directly on Unraid, for an unknown reason, it make my Unraid disconnect of the network, and from the console on the server, after trying to stop docker, restart the network interface and unmount array, I restart the server and my disk (XFS) is corrupt and I need to repair it or format it (I try this twice, same problem. I had it too with a docker-compose of a simple Rabbitmq service). But this is another problem ! Using simple container works great, but the one from jetbrain space is a little more complex to convert in a bash script using docker run. So I used a vm to run the docker compose.

Since I connect from RealVnc using the 192.168.80.100:5009, is there something to do for the VM ? It has an Ip but maybe unraid block the port forwarding ? 

I hope that someone can help me with that. It makes me crazy to not understand why it doesn't work.