534 reply codes
534 : CCC not supported
534: Command command not allowed for connection to secure port
534: Could not stop TLS security
534 : Server does not support the ADAT command for TLS secured connection
534 : Server does not turn off protection for TLS secured control connection
534 : Server is not willing to accept security mechanism
534: Server is not willing to accept security mechanism on this connection
534 : Server is protected and is not willing to accept another AUTH command
534 : Server requires authentication before command processing
534 : Server requires authentication before PASS command
534 : Server requires authentication before USER command
534 : Server setup for TLS failed
534: TLS negotiation failed -- data connection closed
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FTPD reply codes