When i get this kind of email:

Hi Super User,
Rahul Sharma responded to the quiz Morbus Fabry. You can view the details at the following location:
http://www.med-quiz.com/index.php/quiz/results/5-morbus-fabry?rid=10
- Community Quiz Notifications.

I get:
401 - You are unauthorized to perform this operation.

1. Why do I not get an login dialog?
2. Why do I get this message