Your connection is not private
Attackers might be trying to steal your information from <website URL> (for example, passwords, messages, or credit cards). Learn moreNET::ERR_CERT_DATE_INVALID
Is there a cure for this? No warning, suddenly some sites don't load and this message appears.
pqb
MacBook Pro 15″, OS X 10.11
If your MacBook Pro can be upgraded to a newer version if macOS, please upgrade.
MacBook Pro mid 2010 and newer can upgrade to at least High Sierra.
How to get old versions of macOS - Apple Support
If you must operate on El Capitan, these directions (and I don’t have a way to test this) appear likely to resolve the issue with your local certificates on OS X 10.11 and earlier:
If your MacBook Pro can be upgraded to a newer version if macOS, please upgrade.
MacBook Pro mid 2010 and newer can upgrade to at least High Sierra.
How to get old versions of macOS - Apple Support
If you must operate on El Capitan, these directions (and I don’t have a way to test this) appear likely to resolve the issue with your local certificates on OS X 10.11 and earlier:
SSL certificate expiry
