Installed on Nitrous.IO -- no server running for web browser device case

action@discovermeteorxxxxx-xx:~/workspace/meteor-mobile-demo(master*)$ meteor
[[[[[ ~/workspace/meteor-mobile-demo ]]]]]

=> Started proxy.
=> Started MongoDB.
=> Started your app.

=> App running at: http://localhost:3000/

When opening browser at port 3000 from Nitrous IDE preview, the message says there is no evidence of server running: "We couldn't find a server running on this port – are you sure there is a server running?"

No files or tests are mentioned. Start by reproducing the `meteor` command in the Nitrous.IO workspace and checking the `localhost:3000` browser preview; the issue is resolved when the app is reachable there or the supported setup limitation is documented.

Written by the indexing model from the issue text.