FortiGate
FortiGate Next Generation Firewall utilizes purpose-built security processors and threat intelligence security services from FortiGuard labs to deliver top-rated protection and high performance, including encrypted traffic.
mzainuddinahm
Article Id 196251
Description
This article describes how to block or allow YouTube channels and specific requirements.

Related link:

https://docs.fortinet.com/document/fortigate/6.0.0/handbook/659877/youtube-education-filter

Solution
The FortiGate has to be in proxy mode.
'SSL Deep Inspection' needs to be enabled for better and consistent filtering of channels.

Important: In order for this feature to work,  allow access to YouTube, after what the filtering will be done & blocked/allowed as per ‘youtube-channel-filter’ config.

When YouTube is blocked, even the Channels are also blocked regardless of the ‘youtube-channel-filter’ settings.
Hence, allow YouTube as a web rating overrides to a category which is allowed in the configuration if 'Streaming & Download' category is blocked for other websites.

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