Full message is:
The server rejected SFTP connection, but it listens for FTP connections.
Did you want to use FTP protocol instead of SFTP? Prefer using encryption.
The message is always associated with one of the following errors:
For this reason, when you try to connect using the default SFTP protocol to a server that does not have SSH/SFTP service (does not have port 22 open), but it has FTP service (port 21 open), it suggests you that you might have actually wanted to use FTP.
You need to select FTP protocol explicitly on Login dialog.
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