Which ports should be open (otnode)?

The following ports should be opened in order to run otnode:

5278 | 8900 | 3000

What are these ports for?

1. 5278 - is used for node communication. It uses HTTPS underneath.
2. 8900 - is used for node REST API. On default configuration it uses HTTP.
3. 3000 - is used for the remote control needed for Houston app.