Hi again!
I'm sorry, this hasn't worked.
I set the following in flashphoner.properties:
http.address = 0.0.0.0,[::]
https.address = 0.0.0.0,[::]
wss.address = 0.0.0.0,[::]
ws.address = 0.0.0.0,[::]
(I also tried setting the public IPv4 and IPv6 addresses, but without success).
If I restart...