Are you modifying outgoing rules of your default security group? You generally shouldn't need to do that, as long as you trust the servers this is applied to.
aws cli uses https to talk with the amazon API. You should leave port 443 open. You would most likely want to leave port 80 open as well, to be able to get updates on your server.
Hope this helps,
Thanks for this. I thought I had done this but obviously not. That fixed it and all is working. Thanks a lot.
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