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SonicWall CFS & Youtube (Google)

If you're trying to block some Youtube content using a SonicWall firewall and not getting the results you're expecting, there's a few things to note.

1. Firstly, you'll need a Gen 7 SonicWall firewall which supports the later TLS 1.3 protocol
2. You'll also need to deploy DPI-SSL so that the firewall can see the URL
3. You'll need to block UDP 443 going out, which is Google QUIC and the transport layer they use. By blocking, it will use the standard TCP 443 and let the firewall work as expected.