How to block "Google sites"

Question

I've been asked to block games for some student accounts, which I've been able to achieve through the "games" category in Filter Actions and adding a few individual domains. What I haven't been able to block are some "unblocked games" sites, especially ones that are on "Google sites" web sites. 
 
 If someone could tell me how (if it's possible) to block specific " Unblocked Games 66 " web sites I would be grateful. I prefer to encourage students to use their time wisely of their own accord, but I've been asked to do what I can to make game sites unavailable. 
 
 https://sites.google.com/site/bestunblockedgames66/ Thanks,

DouglasFoster · Answer

Since the site uses https, you must enable decrypt-and-scan, often called https inspection. Otherwise the path and querystring are hidden in the encyrpted portion of the packet, and UTM cannot filter what it cannot see. 
 Https inspection has its own issues. Some sites will not work correctly or will not connect at all, so you need good logging and sufficient administrative patience to work the issues as they arise.