localhost 127.0.0.1 is set in the hosts file of windows. Also the names and the IP-adresses of my two PC's on that network.

Now, I've changed several values in start.py, I've changed Hostname to the name of my server and changed the paths etc in start.py. It still gives this error (see previous message)... :-(

You have to edit the FTP module. I think you can call it a bug. Could anyone submit this to the collector, no time to do this. -- I'm busily ignoring some thousand of implications I have determined to be irrelevant.