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#Gitlab just assumes in his guides that the ssh-keygen command is simply available in a windows console. That's a bit optimistic.
@winniehell Thanks. Also found that if you install newer git itself with the right options, it will make the command available in cmd. But it is not default.
@Chaos_99 are you referring to https://docs.gitlab.com/ce/ssh/README.html#generating-a-new-ssh-key-pair ? at least PuttyGen is mentioned there.