First of all, you can check if the Lightstreamer server is correctly installed by pointing your browser to "http://localhost:8080"
You should see a welcome page containing the links to some pre-installed demos. Click on the links to run the demos and verify if they work.
In case of problems, errors are reported in the "Lightstreamer.log" file under the "logs" directory.
If the demos are working correctly, you can check if the Proxy Data Adapter is actually connected to the Node.js Remote Data Adapter by checking the log file.
You should see something like "Connected on port ...."