when I started my core & nlu servers with the endpoints referring to localhost, I was getting the same error I got in my interactive trainer on my regular REST call which was working previously too… Once I shifted it back to rasa_nlu:5000, my regular calls are working, but the interactive training is getting the error that the service rasa_nlu is unknown. It looks like the xformation you mentioned before as core interprets the rasa_core:5000 to local host is not happening in the interactive mode…
[02/Jan/2019:23:30:58 +0000] "GET /parse?model=&project=current&q=hello HTTP/1.1" 200 684 "-" "python-requests/2.20.0"
from the interpreter
rasa_core.interpreter - Failed to parse text 'hello' using rasa NLU over http. Error: HTTPConnectionPool(host='rasa_nlu', port=5000): Max retries exceeded with url: /parse?model=models&project=%2Fapp%2Fproject&q=hello (Caused by NewConnectionError('<urllib3.connection.HTTPConnection object at 0x7fb4f30ecb70>: Failed to establish a new connection: [Errno -2] Name or service not known',))