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sshis indeed trying to ask you about accepting (and adding) the host key, but for some reason/dev/ttycannot be opened. I've never seen that, and it suggests something is quite messed up on your system, but with the info given I have no clue what. (The function nameread_passphraseis somewhat misleading here; it is also called fromconfirminssh_connect.c) If you manually rebuild known_hosts e.g. withssh-keyscanit should avoid this particular problem, although what else may go wrong I cannot say.