WLC 9800 web auth captive portal not working flexconnect

[00u108muzkLWsZGDa5d7]

I have setup a SSID with use web policy using the inbuilt web auth page on the controller. I have setup flex connect profile and selected the central authentication option only. The problem is when i connect to the SSID the captive portal tries to load but I get a error "Error opening page" Hotspot login cannot open the page because the server cannot be found. 

[marce1000]

  -  Debug the captive portal using : https://logadvisor.cisco.com/logadvisor/wireless/9800/9800CWA
      And have a general checkup of the 9800 controller configuration using the CLI command show tech wireless and feed the output from that into Wireless Config Analyzer

 M.

[JPavonM]

Is it your DNS resolution for your captive portal's URL pointing to the right appliance?

[00u108muzkLWsZGDa5d7]

Yes it is but i get a DNS error when using flex connect