Thank you lgillis for pointing out several technical aspects. I finally found the problem and I want to share the solution for all Docker users. Here on GitHub https://github.com/i2p/i2p.i2p/blob/master/Docker.md the documentation insists to show this kind of example also for 2.6.1 ... port portion ...

Hi all, I'm running my I2P router H24/7 on a mini server with Open Media Vault OS. Router runs with Docker. I followed Docker example here http://i2p-projekt.i2p/en/download/docker Required port is open on IPS home router. I successful tested reachability of TCP port by a internet check site. Unfort...