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...entication to "no" will NOT disable clear-text passwords if ChallengeResponseAuthentication keeps its default value "yes" . One also needs to set ChallengeResponseAuthentication to "no". See for details, eg. https://access.redhat.com/solutions/336773 or https://blog.tankywoo.com/linux/2013/09/14/ssh-passwordauthentication-vs-challengeresponseauthentication.html The above code fragment should be replaced by <pre> # To disable tunneled clear text passwords, change PasswordAuthentication and ChallengeResponseAuthentication to no. PasswordAuthentication yes Challen...