I think I am in the same boat as rpj999. I’ve got the Docker running, and by importing my .identity from my previous Crashplan installing (using the plugin on unRAID v5.05), I am able to back up to the unRAID server. However I am unable to connect to the server through the Crashplan UI, unless I do the ssh tunnel through putty.
I also am only able to see port 4242 as open. This is both from a Mac running Yosemite beta 4 (yeah, I know, too many betas) and from a Windows 7 machine.