Unable to block Socks5 Proxy

Hi guys,

I was testing if users could bypass the network restrictions using ShadowSocks. I created a server in Vultr and configured the Socks5 server. On the client side, I configured the Socks5 client. Added it has a proxy in Firefox. I am able to bypass the firewall restrictions. How do I block Socks5 proxy on Sophos XGS? 

The applications filter detects it as a "Freegate proxy" but it is unable to completely block the socks proxy connection.

Edited TAGs
[edited by: emmosophos at 9:50 PM (GMT -7) on 16 Aug 2022]
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