Cisco Wireless | WLC redirects the Guest portal but not prompting automatic on client devices?

Hi,

We have a wireless setup in which guest client should authenticate through web guest portal from ISE server however when client connects to the SSID the client never prompted about the guest portal page. Client are Iphone,android,laptop windows users.

I have validated from logs WLC it is actually sending the guest portal page to client. To get this works, Client needs to open a browser and browse random sites after doing this.. Client able to see the guest portal and able to put their credentials.

From WLC configuration the " Web Auth Captive-Bypass " is already disabled which means it should auto launch on client end.

from logs: *webauthRedirect: Jul 15 06:29:34.205: [PA] **: Client configured with AAA overridden redirect URL https://loginguest.abcd.com:8443/portal/gateway?..... >show network summary Web Mode.................................... Disable ... Web Auth CMCC Support ...................... Disabled Web Auth Redirect Ports .................... 80 <----- Web Auth Proxy Redirect ................... Disable Web Auth Captive-Bypass .................. Disable <----- Web Auth Secure Web ....................... Enable Web Auth Secure Web Cipher Option ......... Disable Web Auth Secure Web Sslv3 ................. Disable Web Auth Secure Redirection ............... Disable ... 

from the network summary I'm seeing that the redirect port is 80/Http which from the above logs we are redirecting 443/https. Am I on the correct page in where I'm checking on global parameters in network summary or should I check the wlan configuration itself?

Any suggestion about the issue?