I want to always have a reverse connection active when I ssh into a machine in case I need to connect but have to go away and I don't have IPv6 (or its firewalled).
But I'm not happy putting my private key on the intermediate machine. I wish key forwarding was a thing.

@wolf480pl No, something like ssh -J. I want to use the intermediate server as a proxy to connect to a client that has ssh -R'd into the intermediate machine.
Unfortunately ssh -J refuses to connect to localhost:<rev port number>

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@lynne
ssh -J jumphost localhost -p <rev-port> # works for me

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@wolf480pl Oh, that actually works very well, thanks. No need to put my keys outside of my personal machines.

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