I got this message in this morning when I wake up, turn on my computer and read newspaper as usual. However, I can’t go to Yahoo.com site as well as Google.com site with a warning message: This Connection Is Untrusted, in my Firefox browser.
In a moment, I don’t know what to do and just want to turn off my computer and leave to fix later. But I think why don’t search Google for some useful tutorials to fix this trouble, and of course I do it by my smartphone.
It takes me a minute to read and figure out how to fix. I was surprised that my computer date and time is set up incorrectly as the article say and all I need to setup it again with the correct one.
After some minutes of work, my computer is now working again and can visit all sites that I could not to access before. I also suggest you to check this point if you are in the same situation like me.