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We had the same/similar problem and we have finally solved it.
Roslaunch uses paramiko to create ssh connections, and it seems that paramiko still does not support the ecdsa algorithm, used now as default by last ssh, so it can't read from the known_hosts file generated with ecdsa and can't create the remote connections.
To solve it, we have deleted the known_hosts file (or the line in particular) and regenerated it (storing the new host when asked) doing the first ssh connection with the following command:
ssh -oHostKeyAlgorithms='ssh-rsa' host
So now, roslaunch/paramiko-ssh understands the known_hosts file and can connect to the remote machine.
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