How to FIX SEC_ERROR_EXPIRED_CERTIFICATE

Solution for Website owners

You have to urgently replace expired SSL certificate to prevent losing the website visitors and customers. The worse thing is that some visitors may "force" browser to access website with expired SSL. In that case, the sensitive information exchanged by the visitor and your server will be not protected.

Solution for Website visitors

• Check if your computer or device has a proper date and time set. The wrong date would for sure effect browsing the websites. Update the time, restart the browser and retry visiting the problematic website;
• Clear the SSL cache. Press the Win + R keys. In the window, type inetcpl.cpl. A new window will appear, in it on the “Content” tab, look for and click on the “Clear SSL” button. Be sure to confirm the action by clicking on "Apply" and "OK. Next, reboot the PC and try again to download the site.

Avoid next steps

We highly suggest avoiding the next solutions published online to solve the issue for website visitors.

• Turning off Firewall or Antivirus is a very bad idea;
• Forcing browser to access website with expired SSL means your traffic and data will be not protected.

Conclusion

• Visitors: Follow the steps described, contact website owner, if they do not help.
• Webmasters: Urgently recheck Expiration period of your SSL and renew if it is expired.