The WebSocket API Developer Guide provides a convenient testing capability where one can connect and test different API calls. I am unable to connect into a test server available to me from the Developer portal. However, if I load the Developer Guide within my browser from my local machine, it works.
To add more clarity: the Developers Portal content is served on encrypted web page and browser will block an insecure websocket connection from a page loaded over https. Either the protocol should be enhanced to support wss, or this limitation should be documented.