if kerberos is installed. So far as I'm aware, kerberos aware clients
detect ECONNREFUSED and (if allowed) fall back to the non-kerberos
servers. They do not know how to interpret messages such as
"rlogind: unknown option -k".
I believe Garrett also mentioned this.
Unfortunately, this adds an extra step to bringing up kerberos.
It also stops /var/log/messages getting quite so many useless (and
confusing) error messages when somebody does a port scan on you.
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