Okay try the following steps:
1. Open Portal in Chrome.
2. Look at the URL, eg.
- Does it have a fully secured green with the green lock in front?
3. If so, click the green lock icon, you will get the following option. Choose "Connection".
4. Click certificate information.
5. Choose details.
6. Scroll down to Field: "Subject".
7. Look at the value of "CN" in subject. If it's: <portal-domain-name> then good. If it contains " * " in the front, it's assigned as a wildcard certificate.