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First try to block 1. youtube.com2. youtu.be3. googlevideo.com4. googleadservices.comIf this not working, check how is policy applied? its on specific vlan? what is target ? Best solution is to block Youtube first on Content Filtering->Category Bloc...
Simply, just create Layer 3 firewall rule into group policy You use for mobile devices and deny UDP:#policy #protocol #destination #portDeny UDP youtube.com 80Deny UDP youtube.com 443...