Security Certificate - is not valid, this warning appears when going to a .gov website

A trusted, vital, much used website suddenly gets warnings that it's security certificate is not valid. I am supposed to enter my social security number on the web page that produces the certificate warnings. I can't navigate further in the web site without getting passed this page. What could be causing the certificate warnings? (This is the Ohio unemployment website)How do I get around this problem without endangering my social security number?

Question Info

Last updated December 1, 2018 Views 44,833 Applies to:

Open Internet Explorer (only) to | Select CUSTOM and scan | Install any Critical Security Updates offered (e.g., KB982381).  If a Root Certificates update is listed in the Optional Software updates category on the left-hand side of the scan results window, install it to take full advantage of IE8's enhanced security & to correct the problem.

NB: Automatic Updates offers Root Certificate updates to Vista & Win7 by default. WinXP users running IE7 or IE8 must seek & install Root Certificate updates manually via Windows Update website. Root Certificate updates are generally released every 3 or 4 months.

~Robear Dyer (PA Bear)
Microsoft MVP (Windows Client) since October 2002

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