Guest Cert problems ISE and Anchor WLC

Question

I'm setting up new Guest Wireless, I have 2 internal foreign 5508 WLC's talking to 2 DMZ anchor WLC's. The guest connects to Guest SSID and the anchor controllers acts as a DHCP server, the Guest interface configured on the WLC is the in the range of the DHCP scope I've setup. The DHCP scope is using the anchor WLC Mgmt interface as the DHCP server.
Guest SSID - is setup for Webauth and Guest is redirected to the ISE server https://wlc.company.com/login...., when the page is presented to the Guest they get cert problem because the cert is not trusted (its an Internal Cert), Guest logins in ok and the AUP says "cert not trusted" 1.1.1.1 name of the WLC wlc.company.com.
In the browser Guest has https://wlc.company.com/loginredirecthttps://1.1.1.1........
1.1.1.1 is the Virtual interface of the Anchor WLC.
How can I get the client to stop using the Virtual Interface for cert. Why is the WLC doing this? I gather something to do with DHCP?
My plan is to apply a External Cert on the ISE for Guests, that way they will automatically trust a cert from Geotrust for example. But I'm going to still run into this Cert "not trusted" problem where the Guest is not trusting the WLC anchor  Virtual Interface 1.1.1 . Why is the guest using the Virtual interface error 1.1.1.1. I've even added the ISE name of the cert to the Virtual interface, same problem, instead its just says  wlc.company.com not trusted. I have also imported the cert onto the WebAuth cert on anchor WLC, still doesn't work.
Hopefully I've explained this ok.....any ideas? but if the Guest page keeps getting presented with
https://wlc.company.com/loginredirecthttps://1.1.1.1........ it will never work.

Answer 1

I followed Richard's advice and started from scratch, removing LWA and implementing CWA -MAB. It didn't take too long to setup CWA and get authentication working, I appled a Preauth ACL on WLC's and on ISE under Authorization pofile (CWA)
This is when the problems started happening, I was using the default ISE Authorization profile
cisco-av-pair = url-redirect=https://ip:8443/guestportal/gateway?sessionid=SessionValueIdValue&action=cwa.which is not what I want, again the certificate is the server cert which is not an external Cert that the guest wants to see. The user can login fine, unlike LWA, with Firefox or IE it would accept the cert and login so at least I had a working Guest wifi solution. Though there was a cert error symbol at the end of the browser url.
The next step I tried was to change the Authorization Profile to
(wireless.company.com which is a C-NAME for ISE box and has this Alias in the cert, this was a test before I apply the external cert)
cisco-av-pair = url-redirect=https://wireless.company.com:8443/guestportal/gateway?sessionid=SessionValueIdValue&action=cwa
I applied the change and the new page appeared on the users laptop, great, but this time users were declined access via live Authentications, reason "Cannot login due to session id expiry, please login a again", I created a new user a/c, same problem. Not good. Ok so I thought well if I want clear all these stale session id's that appartenly exist I'll stop/start the application which I did from the command line, still the same error "Cannot login due to session id expiry". hmmm, whats going on here.
I then rebooted the ISE (this must clear all the sessions!), reboot I performed from home and now for some reason I cannot login to the ISE front end GUI with the admin account or my account. Tried resetting the GUI password for admin and other admin users, the message "Error: cannot reset password this can only be performed on Standalone or Primary node" Well what have I done, just rebooted ISE nothing else apart from changing authorization profile. This box is a Standalone node. Without seeing if the clients connect due t no GUI access, I have referred this issue to TAC!
Also I don't like the fact that your have to install a external cert against the internal node name, epsecially when its external. But again I haven't reached this part yet.