Maybe show us you docker-compose to have a look on how you configured immich’s network?

I didn't change anything, just followed the instructions on the wiki:

version: "3.8"

#
# WARNING: Make sure to use the docker-compose.yml of the current release:
#
# https://github.com/immich-app/immich/releases/latest/download/docker-compose.yml
#
# The compose file on main may not be compatible with the latest release.
#

name: immich

services:
immich-server:
container_name: immich_server
image: ghcr.io/immich-app/immich-server:${IMMICH_VERSION:-release}
command: [ "start.sh", "immich" ]
volumes:
- ${UPLOAD_LOCATION}:/usr/src/app/upload
- /etc/localtime:/etc/localtime:ro
env_file:
- .env
ports:
- 2283:3001
depends_on:
- redis
- database
restart: always

immich-microservices:
container_name: immich_microservices
image: ghcr.io/immich-app/immich-server:${IMMICH_VERSION:-release}
# extends:
#   file: hwaccel.yml
#   service: hwaccel
command: [ "start.sh", "microservices" ]
volumes:
- ${UPLOAD_LOCATION}:/usr/src/app/upload
- /etc/localtime:/etc/localtime:ro
env_file:
- .env
depends_on:
- redis
- database
restart: always

immich-machine-learning:
container_name: immich_machine_learning
image: ghcr.io/immich-app/immich-machine-learning:${IMMICH_VERSION:-release}
volumes:
- model-cache:/cache
env_file:
- .env
restart: always

redis:
container_name: immich_redis
image: redis:6.2-alpine@sha256:c5a607fb6e1bb15d32bbcf14db22787d19e428d59e31a5da67511b49bb0f1ccc
restart: always

database:
container_name: immich_postgres
image: tensorchord/pgvecto-rs:pg14-v0.1.11@sha256:0335a1a22f8c5dd1b697f14f079934f5152eaaa216c09b61e293be285491f8ee
env_file:
- .env
environment:
POSTGRES_PASSWORD: ${DB_PASSWORD}
POSTGRES_USER: ${DB_USERNAME}
POSTGRES_DB: ${DB_DATABASE_NAME}
volumes:
- pgdata:/var/lib/postgresql/data
restart: always

volumes:
pgdata:
model-cache:

The easiest way i can think on how to make your docker-compose work is to reinstall docker and use the host network

I'll try as soon as I can and post here the results, thanks for the time and help!

This seems a badly network configuration on you docker stack !

oops, I have lots to learn I guess XD

The way Docker interacts with the firewall as if it owned the whole system and in particular that this ancient issue is still open without any official comment is one of the reasons I consider the Docker project to be one of the worst widely used open source projects out there.

I haven't set up a firewall yet, I wanted first to make sure that everything works before installing one (I was thinking of ufw)

I have a clean Debian install, I don't know if there are some rules OOTB that can interfere...

Debian does not use NetworkManager I think, because there is no /etc/NetworkManager/ directory :(