1, SSL certificate has expired.
According to the international standards for issuing security certificates, the longest validity period of SSL certificates is 2 years, and the default for purchasing certificates is one year, so everyone must pay attention to their SSL certificate time.
2, SSL certificate installation configuration error.
SSL certificate installation is very complicated, which is difficult for ordinary people to install. You can contact the certificate provider to install it.
3.SSL certificate is not trusted.
At present, there are some SSL certificates on the market that have not passed the global trust. It is recommended to purchase SSL certificates trusted by the whole world, such as Symantec, Geotrust, Comodo, RapidSSL, etc.
4. The effective time of 4.SSL certificate conflicts with the computer time.
This situation can be solved by setting the computer system time.
Step 1: Open the computer control panel.
Step 2: Find the clock, language and region.
Step 3: Select the online time and click Change Settings.
Step 4: Check the synchronization with the Internet time server.