Using version 3.5.
The demo app works great with the default HTTP settings. I followed the HTTPS usage suggestions on their slideshow tour and it worked -- or seemed to. The page is served correctly, but chat messages do not post. Open up the console and get these messages repeated every few seconds up to countout:
Connection down :-( entry.coffee?ts=1377958052923&pathPrefix=app:9
GET https://localhost/engine.io/default/?uid=87789528630674353598151356&transport=polling system?ts=1377958052923:2337
Request.create system?ts=1377958052923:2337
Request system?ts=1377958052923:2269
XHR.request system?ts=1377958052923:2216
XHR.doPoll system?ts=1377958052923:2245
Polling.poll system?ts=1377958052923:2527
Polling.doOpen system?ts=1377958052923:2471
(anonymous function)
entry.coffee has nothing in it but logging functions. That's where the "Connection down :-(" is found, triggered by ss.server.on disconnect.
The gotcha here is that if you're running a HTTPS server, then you'll need to listen on port 443.