Webblocker not blocking youtube from Google Chrome

I have an XTM26w with latest software and webblocker app. I have had on ongoing issue with Google Chrome being able to access Youtube.com but other browsers like The Edge or Int. Explorer in Windows 7 block access like expected by settings in Webblocker. I have deep packet inspection enabled and have tried different rule settings but Google Chrome seems to ignore the settings. Any ideas?


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    Could be that Chrome is using QUIC - UDP ports 80 & 443, not TCP port 80 & 443.

    Also, the source can be from various places, such as q4flrne7.googlevideo.com

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    edited March 2022

    This (blocking TCP and UDP) seems to have worked for me too, although not in all browsers. I wonder if we need to block more ports...

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    james.carsonjames.carson Moderator, WatchGuard Representative

    Hi @SecurityAdmin
    Blocking both TCP -and- UDP 80/443 will leave you unable to access the web.

    TCP 80/443 are the standard HTTP/S ports.
    UDP 80/443 are QUIC, which aren't proxy-able via the WatchGuard.

    You can deny QUIC by policy via the firewall by following the KB here:


    -James Carson
    WatchGuard Customer Support

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