Can the Bitcoin client be used without any incoming ports being opened? Code Answer

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I am running bitcoind on the latest Ubuntu 12.10 Quantal Quetzel on amazon’s EC2 network.

The security group I have attached to the box only allows port 22 so I can login via ssh.

How is bitcoind able to operate, then?

I started up bitcoind and it says it has 8 connections and is actively downloading blocks… but how? When port 22 is the only opened port on my box?
-confused

Answer

Your firewall allows outgoing connections.

Bitcoind creates 8 outgoing connections (by default), over port 8333.

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