HTTP/3 is the third major version of the Hypertext Transfer Protocol where it uses the QUIC protocol.
As of now, the Worry-Free Business Security agent does not fully support HTTP/3 scanning with both Web Reputation Services and URL Filtering. The following workarounds are recommended to still use the mentioned functionalities:
Option 1: Block UDP, ports 80 and 443 via Firewall
This option would automatically shift browser to use HTTP2/1.1 automatically. Please refer to instructions from your firewall vendor.
Option 2: Disable Browser HTTP/3 support
- Microsoft Edge
- Start Microsoft Edge.
- In the Address Bar, type in "edge://flags/#enable-quic".
- Switch the option to disabled.
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- Google Chrome
- Start Google Chrome.
- In the Address Bar, type in "chrome://flags/#enable-quic".
- Switch the option to disabled.
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- Mozilla Firefox
- Start Mozilla Firefox.
- In the Address Bar, type "about:config".
- Search "network.http.http3.enable".
- Shift setting to "false".
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- As an alternative, you can download and use these scripts to automate the modifications.
- Customers can use Geekflare to confirm if the website has adapted HTTP/3.
For support assistance, please contact Trend Micro Technical Support.