Ok, alright, I found the problem : my containers were set to Windows containers.
Now, I have a problem similar to here : Xibo, docker, windows 10, failure - Fixed! Thank you Peter
I don’t plan on running SSL, which only leaves 2 ports : 80 and 9505.
I verified their usage through windows console, they’re both being used by Docker (com.docker.backend.exe), which seems fine to me. Is my problem the firewall or something else?