Sorry for my delay responding; HN Notify just, very belatedly (10 days later), spit out a notification of your reply.
In case the information is of any value, this much later, the first link (at nqsb.io) works for me, now. (So does the second link.)
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.