This parameter specifies the shared secret that will be used
between this <ServerRADSEC>
and RadSec clients
that connect to it. The shared secret is used in the same way as
Secret
parameter in the Client clause: to encrypt
passwords and generate message authenticators. The shared secret must be
configured identically into <ServerRADSEC>
and
all RadSec clients that connect to it, regardless of whether TLS is
enabled or not. An authentication error will occur if the shared secret is
not correctly configured. For compliance with RFC 6614, the default value
is radsec
.