Open the HTTPS site in a browser and use the browser's connection/certificate information to inspect the certificate.
Step by Step
- Open the website using https://.
- Open the browser's site/connection information.
- View certificate details.
- Check the valid-from and expiration dates.
- Confirm the certificate covers the hostname you opened.
- Review the issuer and any browser warnings.
If That Doesn't Work
- A valid certificate does not mean a website itself is trustworthy.
- Certificate chains and intermediate certificates can also cause errors.