Ich habe es gelöst:
C:\temp\ssh>ssh.exe -i c:/users/<user>/.ssh/id_rsa -o UserKnownHostsFile=c:/users/<user>/.ssh/known_hosts <server> Could not create directory '/home/<user>/.ssh'. Last login: Mon Sep 4 13:32:03 2017 from <client> <user>@<server>:~$ exit logout Connection to <server> closed. C:\temp\ssh>