OpenSSH server is enabled by default.
ControlMaster keeps connected for 10 minutes.
HashKnownHosts disabled to permit auto-completion.
PasswordAuthentication enabled - covered by
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Enjoy Chacha20-Poly1305, alternatively AES-GCM and AES-CTR for compat.
GNOS GUI provides a server toggle in the Sandwich menu.
GNOS Apps includes SftpMan for SSHFS and gSTM for tunneling.