Guess your problem is the wrong endpoint in that case. Anyway this is how I start my action server
rasa run actions \
-vv \ #debug flag, gives lots of output
-p $actions_port \ # in your case actions_port=3000
--actions actions \
> logs/actions.log 2>&1 &
And this is for the CLI
rasa shell \
--model models/ \
--endpoints endpoints.yml \
--log-file logs/botrun.log \
-vv \ #again debug flag
-p $rasa_port
And this is endpoints.yml
action_endpoint:
url: http://localhost:$actions_port/webhook