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When connecting to CompleteFTP with an SFTP client, the connection fails and an error message "Format of SSH version is invalid" appears in the log file.
closed with the note: FAQ

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This has been observed when the Linux command-line sftp client tries to connect to CompleteFTP.

The problem was non-English characters in the welcome banner set up in CompleteFTP. Most SFTP clients such as Filezilla deal with non-English characters correctly, but the Linux sftp client does not. Removing the non-English characters from the welcome message in CompleteFTP solved this issue.
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