I looked through the files - I'm still stuck. I checked the logs and with the string "yacyClient.hello" I usually get these errors:
exception: Client can't execute: Connection refused duration=163 for url http://..
as well as ping errors, "network unreachable" and etc. Each error is different, and it does not bring me any closer to diagnosing the issue. If I can't get it up and running, I think I'll shut down the service soon. Too bad, it would have been fun.