Nothing will send chills up your spine quite like going to your bank website or trying to sign in at PayPal and getting a big Invalid or Expired Security Certificate warning in your browser. The warning instantly informs you that This Connection is Untrusted. If you can’t trust the connection to your bank, what can you do. Before you slip into a state of panic, there are two fairly typical reasons for this error message occurring. One cause of Invalid or Expired Security Certificate errors is a problem with your computer. Another common cause of Invalid Security Certificate errors is a problem with the website address you typed into your browser.
One of the most common causes of an Invalid or Expired Security Certificate error is the clock on your computer being wrong for some reason. Website security certificates are issued to be valid within a given date range. Your web browser compares the date of the certificate to the date on your computer to verify the date falls in a valid range. If the date of the certificate is too far outside the date on the computer, your browser will give you an invalid security certificate error because the browser thinks something is wrong. The fix for this problem is to set your computer clock to the correct date and time. It may require a reboot before your browser will view the problem as corrected, but fixing the date on your clock fixes many of these errors.
The other common cause of invalid security certificate error messages is typing in the wrong website address in your browser. For some bank websites, there is a difference between typing https://bankofamerica.com and https://www.bankofamerica.com. Even though both should arrive at the same location, if the bank security certificate is only configured for www.bankofamerica.com you will get an error if you leave the www out of your URL. The error message actually tells you how to fix the problem in cases like this one. Simply make sure you use the website address that supports the security certificate and you will not get the error message.