We have also created a custom captive portal page (at this point we just changed the logo)
We can get to the stage where a client joins the SSID, is presented with the captive portal page, can tick the disclaimer and enter their email address, but then when they submit the page, the web browser just redirects back to the captive portal.
We've tried rebooting the FortiGate, the client machine, "forgetting" the SSID and re-joining from fresh, but this keeps happening.
Has anyone seen this before? What might be going on here?
For testing, I was submitting an email address of email@example.com. The FortiGate was failing to validate the email account (understandably), but the FortiGate's default page for failed emails is exactly the same as the first email collection page, which was causing the confusion.
It appears to be working by submitting a valid email. Hurrah.
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