I wonder if it's only because my version if IE is dated. It's IE8 only because I don't use it.
Were you able to duplicate the error?
Btw, that developer tool in chrome is pretty cool. I have no idea if Firefox has something similar or not.
Edit: Just to refresh my memory...
Failed is supposed to be the response for bad username or password.
Failed2 is for expired (or not accepting) cookies?
I don't know why, but I can never keep it straight.