Rasa action server is not running, shows "server is up and running" but no output further- not in the command shell nor in the browser

[Deprecated] Rasa X Community Edition
#1

rasa_sdk.endpoint - Starting action endpoint server… 2022-07-11 14:06:35 INFO rasa_sdk.endpoint - Action endpoint is up and running on http://0.0.0.0:5055