The time and date of the computer are set incorrectly, which is out of sync with the Internet, resulting in that the validity period of the SSL certificate recognized by the computer is inconsistent with the date of the computer, and risk information will be prompted.
Incorrect SSL deployment: This problem is caused by the website owner. If the website owner does not properly deploy SSL on the server to which the website belongs, the certificate will be invalid.
SSL certificate is a self-signed certificate: a self-signed certificate is an SSL certificate developed by the website owner or illegal elements and is not recognized or trusted by the browser or operating system. Generally, this kind of website will require visitors to download the root certificate of the website to the browser first, and then they will not prompt the risk. But this method has no practical significance, because the self-visa of the website does not mean that the website is credible.
The SSL certificate server failed, which was caused by the failure of the CA authority server that issued the certificate. If you have any questions about SSL, you can consult Wotong Certificate Issuing Center.