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SFTP channel could not be opened

During the preflight checks, you may find the following error is displayed when checking server connectivity:

SFTP channel could not be opened

This is most likely because SFTP hasn't been enabled on your server. You can check that the following line is uncommented and available in /etc/ssh/sshd_config:

Subsystem sftp /usr/lib/openssh/sftp-server

Please note that any changes to your config file will only take effect once you restart your SSH service.