You're getting a 404 from nqsb.io? This: https://nqsb.io/nqsbtls-usenix-security15.pdf works fine for me. What browser/cache setup do you have? Does a `curl` work?

I left another copy of the paper on my homepage at http://anil.recoil.org/papers/2015-usenixsec-nqsb.pdf, but Peter's version or the USENIX site should be fine as well.