Can't open an SSH session because of OpenSSL version mismatch
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apt-get install openssh-server openssh-client.I had the same issue when I updated my system to Debian Testing. Even though SSH was already installed, in my case it wasn't pulled in for updating when I ran apt-get update && apt-get upgrade and so the system still had the same SSH binaries with the now-outdated libraries linked against it, hence the version mismatch.