I have a problem very similar to the one posted here.
I've tried everything suggested but I'm still unable to see the site (that is http://martinlandaumusic.com).
I think the issue has been caused by MAMP (I always use the real domain in the host settings), but with MAMP off, after rebooting, and flushing DNS Cache, I still get a message saying that is not possible to reach the domain (not sure about the exact message, as Chrome set in Italian and even setting English as default still shows error messages in Italian).
This start happening Friday, so I suppose that even providing that the DNS has cached the NXDOMAIN, by now it should have been updated.
This is the result of the host command:
host martinlandaumusic.com 188.8.131.52 Using domain server: Name: 184.108.40.206 Address: 220.127.116.11#53 Aliases: martinlandaumusic.com has address 18.104.22.168 martinlandaumusic.com mail is handled by 0 martinlandaumusic.com.
As far as I can see the address is properly solved, still, the browser (any browser by the way, even the ones I never use) are unable to solve the domain.
Any other device is able to open the website, even in the same network.