I tried following your link, and I was able to log in, so, I had a quick email chat with the QDN web site manager, when I asked him if QDN was working he said:
It’s working fine for me. And I just logged in with no problem. The user may want to clear their cache and try again.
Can you give that a try please.
Full disclosure: I am an employee of Qualcomm Canada, any opinions I have expressed in this or any other post may not reflect the opinions of my employer.