Methods: Select Options → Content tab → Certificate → Import in the browser.
However, the above method is only applicable to self-signed certificates, which are required by every device browsing the site. Self-signed certificates have great security risks, so it is recommended to use ssl certificates issued by authoritative CA institutions, such as GeoTrust, Symante, Comodo, etc.
The second reason is that the ssl certificate used by the website server is not issued by a globally trusted CA organization.
Methods: Therefore, it is recommended to choose internationally certified certificates, such as Symantec, Geotrust, Comodo and RapidSSL.
Third, ssl certificate is not installed correctly. It is necessary to check whether the pre-existing or tested certificate has been deleted. If the certificate of the website is confirmed to be correct, please restart the network server.
Reason 4: The website certificate has expired or is not yet effective.
Analysis: This situation is generally caused by the wrong date in the computer system, and the other is that the certificate needs to be renewed after it expires.
Methods: You can check the valid start and end dates of the certificate information to determine whether the certificate is within the validity period. If it is within the validity period, you need to check whether the computer date is correct. Otherwise, it is the second reason. Ssl certificate is not valid, so you need to contact the certificate issuer to renew it as soon as possible.