firewall – TCP_OUT & TCP_IN for port 8333

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A Bitcoin node can totally take part to the community additionally in case you do not permit inbound connections (to the 8333 port), as an alternative outgoing connections are wanted, these begin from greater unprivileged random ports and are headed to 8333 port of one other node.

In the event you can permit incoming connections is nice for the Bitcoin community well being in any other case nothing unhealthy. (ref. https://bitcoin.stackexchange.com/a/88147/117651)

bitcoin-core may supply a JSON-RPC interface on port 8332, so in case you want it act accordingly.



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