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+1 Also complemented your answer in a new answer with some new data. Putting everything to work is a (nice?) puzzle. I have seen some captive portals in international airports and big malls that were not able to pop up the CNA window. Interestingly enough, when I was putting all the puzzle pieces together last year, I did not find this post.
– Rui F Ribeiro
Commented Feb 2, 2018 at 10:32
We are in 2018 now. Have you worked more on this?
– Rui F Ribeiro
Commented Mar 6, 2018 at 20:28

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