Can I use a third-party splash page or captive portal?
CloudTrax firmware 481 and earlier works with third-party authentication servers that are ChilliSpot- or CoovaChilli-compatible. While these servers are allowed by Cloudtrax, they not officially supported, so we can't assist with related issues.
You can experiment to see if your server will work on the SSID #1 tab. Note that CloudTrax has a free, built-in captive portal system that allows for vouchers, PayPal billing, free access and more.