The AUTH command specified a security mechanism name that is unknown to the FTP server. The security mechanism names supported by the FTP server are GSSAPI and TLS. TLS support can also be requested with a mechanism name of TLS-C, TLS-P, or SSL.
mechname is the name of the security mechanism specified on the AUTH command.
FTP continues.
Reissue the AUTH command with one of the supported security mechanism names.
None.