Hi again,
just to add to the question:
Upload is working, but not download.
Thnkx

I have the same problem.
I use a random port. When I test it I get the same error.
I get a few connections and DHT nodes, but no downloads.
I'm on Win10, Deluge 2.1.1 connected to a wifi router.
Not sure port forwarding would help. I'd like to avoid the complications...
Any ideas??
Thanks in advance.