FortiWIFI 60E gives me: This Connection is Invalid. SSL certificate expired.

[Camilian]

I am not able to access to web sites because Fortinet shows a message: This Connection is Invalid. SSL certificate expired.

the owner of the website indicates that the certificate is up-to-date but FortiWIFI 60E does not have an updated certificate bundle.

How can I fixes this problem?

I tried a lot of the suggested websites and I am still having the problem

[Toshi_Esumi]

Make sure the bundle's version is 1.00028, which was pushed on Oct 1. Then check the intermediate cert of the website is not from Let's Encrypt or R3, with which we have multiple threads of discussions for the expiration issue at the beginning of the month.