A reverse proxy and traffic tunnel to expose endpoints behind a firewall (say, on your laptop or devbox) to the outside world (a VM at a provider, let's say). Sets up a tunnel to the other machine over SSL/TLS. Supports websockets. Reconnects automatically. Implements authentication to keep people from poking around. Supports Let's Encrypt natively.
How to run FTP over an SSH tunnel to another server. It involves setting up a couple of port forwards and FTP in passive mode.
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