UltraSurf Chrome extension blocking

Hello!!

First of all, wich version of FortiOs do you use? and what fortigate model do you have? you have a valid license to use Fortiguard?

According Fortiguard, it's fairly possible stop Ultrasurf:

https://www.fortiguard.com/appcontrol?q=UltraSurf&appcat%5B%5D=IM&appcat%5B%5D=P2P&appcat%5B%5D=VoIP&appcat%5B%5D=Video%2FAudio&appcat%5B%5D=Proxy&appcat%5B%5D=Remote.Access&appcat%5B%5D=Game&appcat%5B%5D=General.Interest&appcat%5B%5D=Network.Service&appcat%5B%5D=Update&appcat%5B%5D=Botnet&appcat%5B%5D=Email&appcat%5B%5D=Storage.Backup&appcat%5B%5D=Social.Media&appcat%5B%5D=File.Sharing&appcat%5B%5D=Web.Others&appcat%5B%5D=Industrial&appcat%5B%5D=Special&appcat%5B%5D=Collaboration&appcat%5B%5D=Business&appcat%5B%5D=Cloud.IT&appcat%5B%5D=Mobile&tech%5B%5D=Browser-Based&tech%5B%5D=Network-Protocol&tech%5B%5D=Client-Server&tech%5B%5D=Peer-to-Peer&popularity%5B%5D=5&popularity%5B%5D=4&popularity%5B%5D=3&popularity%5B%5D=2&popularity%5B%5D=1&risk%5B%5D=5&risk%5B%5D=4&risk%5B%5D=3&risk%5B%5D=2&risk%5B%5D=1&deep%5B%5D=1&deep%5B%5D=0&order=date_updated&sort=desc&page=1

You can block ultrasurf applying Application Control, and block Proxy Category o just block UltrSurf itself.

And then, you have to apply the App Ctrl Sensor to your Internet Policy and that's it!

Tell us it it this work

Bye!