SeaFile 8.0.4 - Seafdav not working?

I trying to activate seafdav on dockerized seafile server 8.0.4.

My seafdav.conf
enable = true
port = 8080
fastcgi = false
share_name = /seafdav

I got “502 Bad Gateway” when I try to connect to “https://my.server/seafdav/

The nginx log keeps laughing at me with errors
2021/05/12 12:09:51 [error] 38#38: *4 connect() failed (111: Connection refused) while connecting to upstream, client:, server:, request: “GET /seafdav/ HTTP/1.1”, upstream: “”, host: “”

Inside the seafile container
netstat -an
does not show port 8080 on LISTEN state, what’s going wrong ?