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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

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Your firewall allows outgoing connections.

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

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  • So I am currently leeching from the Bitcoin network, but not helping it propagate transactions? Is that correct?
    – user3145
    Apr 8, 2013 at 22:27
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    @user3145: You are helping to propagate transactions between the 8 nodes you've made outbound connections to, but that's it. I believe the Bitcoin network has no capacity shortage though, so there's no need to go to special efforts to contribute.
    – David Schwartz
    Apr 9, 2013 at 1:38

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