Go to Security -> Access Control Lists and add two new ACL rules permitting connections to the Captive Portal. Get the Captive Portal IP address from your Captive Portal settings -> Walled Garden -> IronWifi
- Source: Any, Destination: 188.8.131.52 netmask 255.255.255.255, protocol TCP, Dest port 443, Action: Permit
- Source 184.108.40.206 netmask 255.255.255.255, Destination: Any, protocol TCP, Source port 443, Action: Permit
Finally, click on the Save Configuration link to save and apply new settings.