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How is this meant to work for guests then?
I have now imported the certificate to the machine & it is now trusted & all browsers working. I'm confused how this is going to work for guests on their own devices though.
So do I need to use one of the trusted certificates in ISE for the guest portal, like the verisign class 3 public certification authority?
How do I apply this to the guest portal?
Don't think it has anything to do with the admin role. The reboot was actually what fixed it for us. We applied our cert only to the portal role and ISE did not require a reboot, it does require reboot if you are applying it to admin role. For us we were just applying the cert to the portal. You have to reboot for it to work. White screen went away and client was able to web_auth after the reboot.