Zyxel_Emily 
Zyxel Employee
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How to troubleshoot high CPU usage on ATP/USG FLEX?
If you notice occasional high CPU usage on the ATP/USG FLEX, which is causing slow web page loading or management interface access delays, you can follow these steps to collect important diagnostic i…1 -
[2026 January Spotlight] Integrate Secure Cloud Authentication with the USG FLEX H series
As organizations adopt cloud services and support remote and hybrid work models, identity has become a critical foundation of modern security. Traditional authentication methods based on locally mana…1 -
[ATP/FLEX] What is the maximum number of Static DHCP table supported on Nebula firewall?
Question: What is the maximum number of Static DHCP table supported on Nebula firewall? Answer: Nebula mode USG FLEX 100 60 USG FLEX 100W 60 USG FLEX 200 150 USG FLEX 500 300 USG FLEX 700 450 ATP100 …1 -
[Nebula] The window for 2FA does not launch when VPN is connected
Question: When the user use Windows native client to establish IPSec VPN to Nebula firewall, the window for 2FA does not launch and Internet does not work. How to access the 2FA page? Answer: If you&…1 -
Re: Uncheck "Authenticate Client Certificates" from CLI on USG Flex 500 H
Hi @kaika313, Here are the commands to disable "Authenticate Client Certificates". usgflex200h> edit running usgflex200h running config# vrf main http-server secure-server auth-client fa…1
