I have a front-end thats should connect to back-end with a websocket

var socket = new WebSocket('ws://localhost:3000/api/online/call');

Also I trying create a connection with a SSL and using 127.0.0.1, like

...wss://localhost...
...ws://127.0.0.1...
...wss://127.0.0.1...

but none connect, always creating the websocket (using new webSocket) with readyState 3 (code to Closed connection).

I developing in Ubuntu WSL on Windows 10 with disabled firewall.

Can anyone help me to understand whats happening?