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And... it turns out there was nothing wrong with the tunnel. The problem was that starting an embedded nrepl server inside a docker container requires an explicit binding to "". Without that, the nrepl server by default binds to "localhost", which makes it inaccessible from outside the docker container, despite the port mapping, because the docker ...


The Wireshark screenshot on the FTP server is interesting -- the lack of a response suggests that it either can't (routing/NAT issues) or won't (firewall) respond. My ideas: Does the FTP server have a local firewall (check with iptables -L -vn) dropping any traffic? If iptables's INPUT or OUTPUT chains have the DROP policy but you don't have rules allowing ...

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