I see from the images that the host is 64.122.xxx.xxx:80 if you are sure that the host file has that ip address pointing to the domain name that was set in your Kentico site, and the issue happened after an upgrade I would contact support about it.
for anybody else that is interested, the images above are at:
http://s2.postimg.org/8syemilxz/K7_1.png
http://s23.postimg.org/5kyk4t53d/K7_2.png
http://s11.postimg.org/405aj7l9e/K7_3.jpg
http://s7.postimg.org/s1tdfngux/K7_4.png