Make sure that the server’s host is accessible from the internet and that **the following ports are open and available**: * Port `7900` is used by catapult-server to communicate between nodes. * Port `3000` is used by the REST Gateway to expose the endpoints to interact with the node.
I see symbol-bootstrap configures port 7902 too.
Symbol whitepaper says this is for notification subscriptions by clients.
Is it used by existing wallets?
Should we open it at firewall level?