I have a feeling that this does not affect many people but for those that it does, I hope this is helpful. About 4 weeks ago I notified Aon that their website certificate is out of date on Google Chrome.
Google notified websites, sometime last fall, telling them that their website protocols need to change. While they missed the Google announcement (they were not the only one) 4 weeks later, Aon still has not made the change!
Aon should not have missed the Google notice about the update. Aon slow (so far not correction) is ridiculous and makes me question their security level. If I had a choice, I would not use Aon as I have lost all confidence in their concern about website security. Unfortunately, they have a contract with my former company.
Here is information about certificates https://www.us-cert.gov/ncas/tips/ST05-010
A bit of a rant but if you have control over your Aon account, I would find another provider.
If you see the red 'x' through the lock on the address website bar, you are risking your information if you log-on.