The server received an AUTH command specifying a security mechanism that the server is not configured to accept.
The command fails. FTP continues.
Reissue the command specifying an authentication mechanism that the FTP server is configured to accept or have the system programmer change the FTP server to accept the requested authentication mechanism.
Change the FTP server FTP.DATA file to specify EXTENSIONS AUTH_GSSAPI to accept the GSSAPI authentication mechanism or EXTENSIONS AUTH_TLS to accept the TLS authentication mechanism.