Login.yahoo.com uses an invalid security certificate.

A "certificate-error" occurs when you access a "secure-HTTP" site (one that uses the 'https://' prefix for the URL) and the "certificate" that the site is "secure" (namely that the site really is the site that it claims to be) is invalid. Certificates have a "start-date" and an "end-date" and certificates can be "revoked". If the certificate is for a different web-site ('web.site.com' versus 'www.site.com') or is revoked, or if the current date is not between the "start" and "end" date, you get the "certificate error" message.

What site did you try to access?

I tried everything suggested above and on other sites, which included updating time and date, cleaning history, cleaning registry, re-installing Chrome, downloading new certificates from Microsoft. Nothing worked. I went to my Antivirus Program (Bit Defender). Under "Privacy" find the switch for "Scan SSL" Turn switch off. Now Chrome works great!

There is nothing to worry about. This issue is just because of the date settings on your PC. Adjust the date and you would be able to log-on normally.

Let me know if any further clarification/ assistance is required.

Good Luck!
Appreciate generously, if the solution could have been of any help!
CreativeTECH

Unless you set your browser up for high security, this certificate is bogus. Rarely does a security certificate notice appear on yahoo without having set your browser up for high security.
Lower your security if it set to high and see if the message disappears. If your browser security is set to normal, then this is a bogus certificate for a bogus yahoo site.

Contact yahoo.com and explain them this situation. You do not have to worry about security certificate inquiry in any way unless you are doing financial transactions like purchasing a commodity over the internet with your credit card.

I hope this solves your problem!

problem us.data.toolbar.yahoo.com:443 security certificate

change your pc clock to the correct time, date and year.

This Connection is Untrusted
You have asked Firefox to connect

check your computer date!!!!

Jusnet Business Institute-Malindi

Certificate issue... Try resetting your IE to default under Options >> Intrnt Options >> Advanced

Check the time on your computer. If it's wrong, the computer thinks the certificate is out of date, or not in date yet.

Hope this fixes the problem for you!