I can SSH into my instance from the terminal like this:
ssh -i <path_to_private_key> <username>@<external_ip_address>
But I can not connect Robo3T via an SSH tunnel, using the same credentials - I get the error:
Resource temporarily unavailable. Authentication by key (/home/alex/.ssh/id_rsa) failed (Error -16). (Error #11)
Has anyone managed this, and if so, how can I?