$ ssh -L 6010:localhost:6010 foo exit bind: Address already in use channel_setup_fwd_listener: cannot listen to port: 6010 Could not request local forwarding. $ ssh -L 1.2.3.4:6010:localhost:6010 foo exit bind: Can't assign requested address channel_setup_fwd_listener: cannot listen to port: 6010 Could not request local forwarding.