Firmware Version 4.5 and above
Applications like Ultrasurf use tunneling, proxies and other evasion techniques to get around filtering of firewall devices.
To block UltraSurf, follow the below steps
Create an Application Policy to block UltraSurf Go to App Filter : App Policy and add an application policy. Select 'Applications' as Policy Base and select 'UltraSurf' application as shown below
Click on 'Add' to save the policy
After creating policy, you need to use this policy by adding it in a firewall rule. Provide the relevant information, like source address, destination, you can also select the users/groups on which this policy can be implemented.
You need to then select the created above in the 'Advance Policy' as shown below
Click on 'Add' to save this rule and finally 'Install Policy' to implement this policy.