After configuring the guest portal, users connected are being redirected to IP ( http:// of ap>:9997) / i want to get them redirect to an fqdn instead. Appreciate if someone helps me in doing this. Thank you
I believe you need to have the SSL certificate on the Controller.
If the guest portal is HTTP the AP will use IP address for redirection even if it has certificate. if the guest portal is HTTPS AP will use FQND [since HTTPS include certificate exchange].
AP shall create a DNS entry for controller FQDN and provide a page with FQDN.
The local DNS should resolve the Controller UP to the name.