This option enables you to control TLS support on the TELNET client. Negotiation of the arrangements for authentication is handled by TLS in this case to relieve the load on TELNET.
You enter the options for using TLS support as follows:
-Z <option>
Time when the options or changes to the options should become effective
The -Z OpenSSLlibName option is only evaluated once during a TELNET session, namely when the OpenSSL library is loaded. All other options become effective after the connection to the TELNET client has been set up.
Description of the -Z options
The -Z options are described below.
The following must be observed here:
With the exception of the -Z tls-required option, all the -Z options can also be used for the AUTHENTICATION option (see "-B option - Enable/disable the AUTHENTICATION option") as this operates with TLS support.
The -Z OpenSSLlibName option is also relevant for the ENCRYPTION option relevant, as only encryption routines from the OpenSSL library are used.
Simultaneous specification of the ENCRYPTION option (-H, see "-H option - Enable/disable the ENCRYPTION option") and either the START-TLS option (-tls-required, see "-Z tls-required") or the AUTHENTICATION option (-B, see "-B option - Enable/disable the AUTHENTICATION option") results in an error when the TELNET server is started.
Simultaneous specification of the START-TLS option (-Z tls-required) and the AUTHENTICATION option (-B) results in an error when the TELNET server is started.