Suddenly, most sites have invalid signature. That includes sites that I visit on a regular basis. Firefox is unusable-I can't visit most sites
secure connection failed- all of a sudden, this is most sites, including sites I visit daily
secure connection failed-
all of a sudden, this is most sites, including sites I visit daily
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see this answer:
You can check the date and time and time zone in the clock on your computer: (double) click the clock icon on the Windows Taskbar.
- https://support.mozilla.org/en-US/kb/what-does-your-connection-is-not-secure-mean
- https://support.mozilla.org/en-US/kb/troubleshoot-time-errors-secure-websites
- https://support.mozilla.org/en-US/kb/secure-connection-failed-error-message
You can check if there is more detail available about the issuer of the certificate.
- click the "Advanced" button show more detail
- click the blue error text (SEC_ERROR_UNKNOWN_ISSUER) to show the certificate chain
- click "Copy text to clipboard" and paste the base64 certificate chain text in a reply
If clicking the blue error text doesn't provide the certificate chain then try these steps to inspect the certificate.
- open the Servers tab in the Certificate Manager
- Options/Preferences -> Privacy & Security
Certificates: View Certificates -> Servers: "Add Exception"
- Options/Preferences -> Privacy & Security
- paste the URL of the website (https://xxx.xxx) in it's Location field
Let Firefox retrieve the certificate -> "Get Certificate"
- click the "View" button and inspect the certificate
You can see detail like the issuer of the certificate and intermediate certificates in the Details tab.