[Python] docker, waitress with flaskr [Errno 99] address not available

I've got an Azure VM up with docker, Ubuntu 22, and netconfig ready and ports open in 5000-5005. When I'm trying to compose the app to check if it's properly deployed Im getting the following error:

File "/usr/local/lib/python3.11/site-packages/waitress/server.py", line 78, in create_server last_serv = TcpWSGIServer( ^^^^^^^^^^^^^^ File "/usr/local/lib/python3.11/site-packages/waitress/server.py", line 243, in init self.bind_server_socket() File "/usr/local/lib/python3.11/site-packages/waitress/server.py", line 364, in bind_server_socket self.bind(sockaddr) File "/usr/local/lib/python3.11/site-packages/waitress/wasyncore.py", line 374, in bind return self.socket.bind(addr) ^^^^^^^^^^^^^^^^^^^^^^ OSError: [Errno 99] Address not available
​

My Dockerfile consist of:

FROM python:3.11-alpine

ENV FLASK_APP=flaskr ENV FLASK_ENV=production

WORKDIR /app

COPY requirements.txt requirements.txt COPY dockerstart.sh start.sh COPY Crypto/py-fhe /app/Crypto/py-fhe RUN apk add build-base python3-dev libffi-dev linux-headers net-tools wireless-tools gmp-dev mpfr-dev mpc1-dev RUN pip install --no-cache-dir --upgrade pip \
&& pip install --no-cache-dir -r requirements.txt \
&& pip install /app/Crypto/py-fhe

COPY . .

EXPOSE 5000 CMD ["./start.sh"]


My docker-compose:

version: '3'
services:
node-1:
image: thing1
ports:
- "5002:5000"
networks:
- container_network
environment:
- PORT=5000
node-2:
image: thing2
ports:
- "5003:5000"
networks:
- container_network
environment:
- PORT=5000
node-3:
image: thing3
ports:
- "5004:5000"
networks:
- container_network
environment:
- PORT=5000
node-4:
image: thing4
ports:
- "5005:5000"
networks:
- container_network
environment:
- PORT=5000
networks:
container_network:


requirements file:

pyzmq~=25.1.2
flask~=3.0.2
phe~=1.5.0
psutil~=5.9.8
firebase_admin~=6.5.0
damgard-jurik~=0.0.3
waitress~=3.0.0


and the dockerstart.sh script is just the starter for waitress:

#!/bin/sh
waitress-serve --call --host <<azure public ip>> --port=$PORT "flaskr:create_app"


after the 4 nodes are ready, it should launch properly, but Im getting the above error in every node log, and obviously I cannot get into the deployed web, it gets stuck in a loading loop.

Doesn't matter anything, cannot get into the page, and i dont know if im missing anything, or ive got a wrong port config in my vm. Any idea?

Edit: Ive got a dns set up too, and ive also tried to run it into localhost, but nothing would work.

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