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536 FTP Reply Code  -  KB Article #1541

Related Articles --

Example Reply
536 Requested PROT level not supported by mechanism.

A 536 reply code may be sent in response to a PROT command when the requested protection level is unsupported by the current security mechanism. It is a permanent negative reply, which means the client is discouraged from sending the command again since the server will respond with the same reply code. Negotiating a different security mechanism using the AUTH command may result in a different reply code.

Possible Commands

See Also