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The shell's $! variable only knows the pid of the process started by the shell. As you suspected, the ssh call using -f forks its own process so it can go to background, so the overall process tree looks like [1]: shell | +--ssh<1> (pid is $!) | +--ssh<2> (pid is different) ssh<1> exits very shortly after invocation; therefore, the ...


This error means that the server sent an unrequested forwarded port that the client didn't expect. In short, the dropbear SSH client doesn't know how to handle the dynamically allocated port forward which the remote server has allocated for it. It is unsupported by dropbear. The relevant code: Where the dropbear client parses the remote forward request and ...

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