I am using 188.8.131.52 build 8. I think it is really old.
Under Configure -> WLANS, i created a WLAN and there are 3 options for WLAN usages type - Standard Usage, Guest Access, and Hotspot Service.
When I select Standarad Usage and set up a WPA2 password and have a laptop connect, I am able to connect to the Internet. When I select Guest Access, It says that Guest access policies and access control will be applied, and go to Configure -> Guest to configure the settings. All I see here is to use Guest Authentication, redirection, guest pass generation, restricted subnet access, and portal logo changes. I do not see any option that says "enable captive portal".
I do not want to authorise guests to connect to my internal network, which is why I set up a local DHCP server on the firewall to provide guests who connect to this SSID an IP to connect to the Internet.
I can set it up the standard usage, where user connects to AP, gets an IP via DHCP from firewall, which then NATS to a public IP to connect to ISP. However, When I enable Guest Access so I can generate a guest pass (which i am able to do as I have management access to the ZD), I am not able to get a laptop connected to the Internet. An IP address is assigned, but is not directed to a page where I can enter the guest pass to give me access to the Internet.
Would upgrading to later version be more helpful?