when using an old telnet client. Unfortunately in most of these cases,
the user name is not known.
There should also be a way to tell the difference between bad
authentication (such as with expired tickets) and no attempt to
provide authentication (such as with an old client).
git-svn-id: svn://svn.h5l.se/heimdal/trunk/heimdal@279 ec53bebd-3082-4978-b11e-865c3cabbd6b
2a8068132e