[RESOLVED] Captive portal authentication
That’s happens because after the first login the mac address of the guest device is registered as "Remembered device" to avoid any subsequent login and makes better the guest experience.
To delete the device, you have to go to the menu:
UPAM>GUEST>GUEST DEVICE and select the tab Remembered devices then select the device and click on Delete. After this procedure the next login will be redirected to the landing page.