hi teams I have configured external portal authentication on the central, and the portal can pop up normally after the PC is connected, but it cannot be successful when it is redirected to the iap page：test portal is clearpass guestthis central config：DNS can work normally, but the packet capture does not resolve to the correct iap ip address：In the same environment, the authentication can be successful using an iap that has not joined the central.Where should I check?
so i take it that the PC gets redirected to the guest page on ClearPass correct?then when the user types the credentials or accept terms and then the user sees the securelogin waning/error.if this is the case, yu need to upload the public HTTPS certificate for IAP's captive portal , so that the users dont see this warning/error.you also need to reference the new cert in ClearPass guest weblogin.
case solved, it's the iap domain name issue
good troubleshooting !
Thanks for your help
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