I get "Invalid security certificate" message

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.

Here's how your screen may look with the error message:

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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:

 
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