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Subject: No supported authentication methods available (server sent public key)
Filezilla is able to use ssh-agent if it is running. It should not be necessary
to import any .ppk
format keys; otherwise, unenecrypted keys can be created
with puttgen. The client should be set to "Interactive", for key-based login.
This error appears similar to "(permission denied, public key)" in OpenSSH.
Make sure that the account lists the contents of id_rsa.pub
in the relevant
authorized_keys
file. If the user can't log in via the command line with
ssh
, then Filezilla certainly won't work, so you might as well debug that
first.