-Z tls-required

The -Z tls-required option is used to enable and disable TLS security via the START-TLS option on the TELNET client.

-Z tls-required

[ ={ yes | no | optional } ]

yes

START-TLS support is enabled. If no TLS security for the connection can be established, the connection is terminated.

optional

START-TLS support is enabled. If no TLS security for the connection can be established, the connection is used without this security.

no

START-TLS support is disabled.

-Z tls-required specified without operands

-Z tls-required = yes applies (START-TLS support is enabled).

-Z tls-required not specified

START-TLS support is not enabled (default).