Clarification on how FtpReply.Success and FtpStatus.Failure are determined

[HarshitDubey-Raik]

Hi team,

I’ve been reviewing the internal implementation of GetReplyInternal() and UploadFileInternalAsync() in FluentFTP to better understand how success/failure is determined after a file upload.

From the source, it appears that FtpReply.Success (and consequently FtpStatus.Success) is decided purely based on the FTP reply code — specifically when the code starts with 1, 2, or 3, as per RFC 959.

Could you please confirm if that’s correct?
Or is there any additional internal logic (e.g., message parsing, command type handling, or timeout logic) that can influence whether Success is considered true or false?

Thanks for maintaining such a great library! 🙌

[robinrodricks]

Yes that's correct. Most functions are pretty easy to open up and read the implementation. Success is only returned when the file has transferred correctly, to the best of the library's knowledge. It can also be Skipped when transferring multiple files and the file already exists on the server.