FYI, Here is what TAC found:
Latest Status changed to:
1. Had conversation with customer regarding the issue.
2. We verified the logs & found that we had custom cert mapped under server certificate option.
3. Common Name on the certificate was set to companydomain.com
Hence, the wireless users were being redirected to this controller's Web GUI.
4. We changed the server certificate mapping under Web-server to default post which the users were redirected to the actual website.