Block all websites using https when Decrypt & Scan HTTPS is enabled

Question

Hi everyone! 
 I have problem with the feature Decrypt & Scan HTTPS is checked. 
 The situation is this, I am blocking facebook and youtube during office hours and to be able to block also facebook and youtube mobile apps I enable the Decrypt & Scan HTTPS on the firewall but the problem is that all websites using https also are blocked like google.com and etc. 
 How can I block facebook and youtube mobile apps without affecting desktop browser who uses other websites like google, wikipedia, amazon and etc.? 
 Anyway I am using XG Firewall. 
 
 Thanks, 
 buzz

Proudmore · Answer

Hi Sir, 
 Good day 
 Let me try to give an advise, hope it may help you 
 1. If your problems are blocking youtube and facebook thru mobile phones - Simply Block these URL into web policy and untick the decrypt and scan -As I tested this, When using mobile you must need to clear all the cache data in your mobile phone to adapt the block policy 
 2. When you enable decrypt and scan, you must add certificate from sophos firewall into your browser 
 PS. I'm also a newbie 
 Muchas Gracias