Question Mac 10.11.6 "Your connection is not private" error for many websites


Sep 12, 2017
On several very common websites (from Uhaul, to, to Oscar Health Insurance), neither Google Chrome nor Safari will not load the website. Chrome gives this error:

Your connection is not private
Attackers might be trying to steal your information from (for example, passwords, messages, or credit cards).

When I click in the address bar, "not secure" > "certificate (invalid)", this is the error message:

Issued by: COMODO RSA Domain Validation Secure Server CA
Expires: Sunday, November 1, 2020 at 6:59:59 PM Eastern Standard Time
This certificate has an invalid issuer

In Safari, it gives a similar error message:

"This website may be impersonating to steal your personal or financial information"

Troubleshooting steps I've tried so far:

1.) Running available Mac OS updates
2.) Resetting date and time
3.) Uninstalling and reinstalling Chrome
4.) Deleting all Chrome extensions
5.) Deleting all certificates from Keychain
6.) Installing Malwarebytes and running a scan (it didn't find anything)
7.) Turning firewall off
8.) Clearing Chrome cache/cookies

This is my home wifi network; other devices aren't having any issues. At this point, I'm not sure what it could be; I've tried every troubleshooting step out I can find. My only guess is that maybe it's some stubborn virus Malwarebytes didn't catch? I'm not super duper tech literate, so maybe there's something I'm not thinking of.

Thank you in advance so much for your help!!


Your OS is quite dated, so security updates (the lack thereof) are likely the issue. Another factor could be your system time, make sure your time (including timezone) is properly set.

What model Mac are you using?