This certificate message is MITM (Man-in-the-middle) protection. If you get this message, it means that some new certificate/application has been found on your device that has access to device traffic ( for example, anti-virus applications that need to monitor traffic to block threats) and is trying to stop access to a website.
- As for how to view certificates, there can be numerous different ways (as the certificate is stored on the device), one of which is described here: https://codesigningstore.com/how-to-view-certificates-on-windows-10
- Our blog post explains web certificates in more detail and what you should do if you see a certificate warning.
Here's how your screen may look with the error message:
Investigating further, we can see that it's clear that the certificate details have changed since it's being interfered with. In this case, it was a Cisco firewall and the website is safe to acces: