I would like to turn off password authentication for SSH to my server, using keys instead. I don't see an option in Filezilla to use a public key though: is this not a feature of the SFTP spec?

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1) I can't connect from my Windows 10 PC using Filezilla SFTP to my Mac Mini (Yosemite); Filezilla immediately says, "Server unexpectedly closed network connection". However, I can telnet to port 22 ...