Captive Portal with USG Flex 100

Lutzer

Dear Zyxel Community Support Team,
I am currently configuring a USG FLEX 100 (AP is NWA5123-AC) with a Captive Portal for our guest network (VLAN 10, subnet 10.0.10.0/24). While the portal itself works perfectly when accessed directly via http://10.0.10.1 , automatic redirection for unauthenticated users does not function - no portal appears when users try to browse the web, and Firefox shows "NS_ERROR_OFFLINE" (or similar errors in other browsers).

Is there a specific setting I’m missing for automatic redirection?

Does the USG FLEX 100 require additional NAT or routing rules for this to work?

Are there known limitations with certain devices (e.g., iOS/Android)?

I’d appreciate any insights or troubleshooting steps to resolve this. Thank you for your support!

Best regards,

Lutzer

Zyxel_Judy

Hi @Lutzer ,

To better assist you, could you please provide the following information?

1. What management mode are your USG FLEX 100 and NWA5123-AC currently using — Nebula, Standalone, or AP Controller mode?
2. How have you configured the automatic redirection portal for unauthenticated users? Please describe the steps in detail, include the configuration path, and provide screenshots if possible.
3. Could you confirm the guest network (VLAN 10) is for wireless clients only, and that the unauthenticated users you are referring to are wireless clients?

Lutzer

Hello Zyxel_Judy,

1. Standalone - i switched from NXC2500 (EoL) to USG 100 Flex Web Authentication only.
2. I don't know how I can find the automatic redirection portal for unauthenticated users. I think, there is no Option like this in my USG 100 Flex.
3. yes absolutely!

I tested it with my Android Phone and it works fine. The Captive Portal option pops up and I can login. But on my Linux laptop (connected via Wi-Fi to the guest network), there is no captive portal detection.
When I open the Firefox browser, I should normally be redirected to the captive portal login page as long as I’m not authenticated. However, this only works if I manually enter http://10.0.10.1 in the address bar.

From other networks (Hotel or City Hotspots), I automatically redirected to the captive portal when I try to access any website and haven’t logged in yet. But this automatic redirection isn’t working with my USG Flex 100.

Thank you for helping me!

Best regards,

Lutzer