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I want tinc to listen locally on loopback, so that port 655 is not exposed on any system interfaces. Can't tinc make outbound connections when listening on loopback? I can't see any reason why it should. This system will never have other tinc daemons connect to it, it will only ever connect to other tinc daemons in order to establish a VPN connection. -- Jonny Tyers On Sat, 17 Nov 2018

...to make outbound connections. Why are you worried about exposing port 655 on any system interfaces? You should be using a firewall to make it not exposed externally. If you're worried about it being exposed internally, loopback has the same issue as any user or application can connect to it. Jookia.