First line is probably a mistyped password when accessing the admin interface.
Actually, when you first attempt to load the adming page, you get a 401 error so that your browser knows to pop up a password box.
No idea about the fourth one.
rtc on nslu2 is notoriously bad. I think that’s what the mdns system picks up. Again, it notices it and corrects for it, so it’s not a huge deal.