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...e .ssh/config file. I also have a shell script whose purpose is to hop to a remote host through a port forward, which uses the ProxyCommand option like this: ProxyCommand ssh MAIN nc 127.0.0.1 7777 because the remote host is accessible via port 7777 on host MAIN. So the script invokes an ssh commandlike this: ssh -o "ProxyCommand=ssh MAIN nc 127.0.0.1 7777" remoteuser at MAIN The expectation is that the inner proxycommand ssh goes via the control socket and that the outer ssh uses the ProxyCommand to get to the remote host. Imagine my surprise when the ControlMaster from the confi...