Why can't I block websites using the Web Content Filter on ATP and USG FLEX?

Zyxel_Emily
Zyxel_Emily Posts: 1,396  Zyxel Employee
Zyxel Certified Network Administrator - Security Zyxel Certified Sales Associate 100 Answers 1000 Comments
edited August 9 in Security Service

Question: 

Why can't I block websites using the Web Content Filter on ATP and USG FLEX?

Answer: 

It is not a bug. The issue is related to the browser update with TLS 1.3 Kyber support introduced in May 2024.
If you are experiencing issues with blocking websites using the Web Content Filter, please ensure that firmware on your ATP and USG FLEX is upgraded to the latest date firmware.
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