We have two SSID one for employees and the other for guests as follows snapshot,
But we observed the issue as follows,
1- sometimes in some MAC Book endpoint splash page is not coming directly as we connected to SSID.so in that case we need to open the browser and need manually browse the random IP address or any yahoo.com or youtube.com. then we get that splash page.
2- sometimes we get a splash page in some MAC Book endpoint but while putting username and password it takes lots of time to load the process or sometimes we need to forget SSID and do all the process again.
3- for guest portal we need to wait for page where guest will feel his all information.
is it endpoint misbehavior or endpoint browser base problem ?
It revolves around something called "Captive Portal Detection". It typically revolves around the device trying to retrieve a magic URL when they first connect to WiFi. If they get a known page, they know they have direct access, otherwise, it is a captive portal.
A quick Google shows me Apple has decided to "upgrade" to a new captive portal system - which no WiFi provider is doing.