When running Stratum behind a firewall as a "miner", does stratum (via miner software) need an INCOMING port open for communications back? For example, I the pool uses port 6666, I can connect to the pool because all OUTGOING traffic is allowed, while all INCOMING (except SSH) is blocked.
If port 6666 is closed does Stratum/Miner still have all the functionality it needs?
I did see one or two UFW BLOCK notices in the firewall logs for the Pool IP. But perhaps that was just the Pool checking if a worker was down?