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500 'ÿABOR': command not understood.

The ÿ (0xFF) is part of an OOB command (IAC) that is sent to the server by the FTP client to abort the data connection. Some servers do not understand OOB (Out Of Band) commands and they assume ÿ is the first character of the next command. To get the ABOR command to work with SmartFTP your FTP server must support OOB.

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