The AUTH FTP server subcommand defines the authentication/security mechanism that is used for the current FTP session. The syntax of this subcommand is:
AUTH [ TLS-C | TLS-P | TLS | SSL ]
Parameter values:
| TLS-C | Utilize the Transport Layer Security (TLS) protocol as the security mechanism. The security settings for the data connection use the RFC2228 defaults; that is, there is no implicit protection of the data connection. |
| TLS-P | Utilize the TLS protocol as the security mechanism. Also, implicitly protect the data connection (which is equivalent to the command sequence AUTH TLC-C, PBSZ 0, PROT P) |
| TLS | Synonym for TLS-C. |
| SSL | Synonym for TLS-P. |