Block youtube

Hi community

I have a web policy that blocks particular urls of which youtube is a part. The concern that I cannot properly block the site on my network when I use the DPI filtering mode.

The site is inaccessible but the notification returned is not the one used by sophos.

However, with the same rules when I use web proxy mode instead of DPI, it works fine.

Is there a way to solve this.?

Added TAGs
[edited by: emmosophos at 8:36 PM (GMT -7) on 13 Oct 2021]