-Z maxProtocolVersion - TLS protocol selection

This option specifies the maximal TLS version to be used by the TELNET client. It replaces in future together with the option -Z minProtocolVersion the old option -Z Protocol. Until then the three options work together, i.e. only TLS protocol versions are supported, which conform to all three options.

Because TLS versions older than TLS 1.2 are declared as "deprecated" by the IETF, TELNET now supports only TLS protocol version 1.2 or newer.

-Z maxProtocolVersion

={ TLSv1.2 | TLSv1.3 }

TLSv1.2

TLS protocol version 1.2.

TLSv1.3

TLS protocol version 1.3.