Cannot initialize SFTP protocol. Is the host running an SFTP

I am attempting to connect to my dedicated server via winSCP, and I continue to get this error.

Cannot initialize SFTP protocol. Is the host running an SFTP server.

Then there is some more below it, but anyone seen this before? Any solution?

For details about error message "Cannot initialize SFTP protocol. Is the host running a SFTP server?", see: https://winscp.net/eng/docs/message_cannot_initialize_sftp_protocol