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1. The website SSL certificate is no longer valid.

First check whether the certificate has expired. SSL certificates must be issued no more than 39 months ago. Therefore, generally SSL certificates are only valid for one to two years. Website administrators should check whether the certificate has expired from time to time. If it has expired, please renew the certificate in time or purchase a new certificate.

If you applied for an SSL digital certificate from Gworg, there is no need to worry. Gworg will start reminding you and assisting you in renewing the certificate in the first three months.

2. The computer system time is wrong.

If your computer time is set incorrectly, it will also result in a prompt that the certificate is invalid or expired. Please check whether the system time is accurate. If the system time is not within the expiration date of the SSL certificate, the browser may prompt that the SSL certificate has expired or is not valid.

3. The certificate of the external connection website has expired.

If the first two methods cannot solve the problem, check whether the certificate of the external connection website has expired. The site refers to other external links that have deployed https security certificates. If the certificate of this external link expires, a corresponding error will be prompted. Terminal devices that can detect certificate errors in external links are: mobile browsers, PC IE6 (no prompts for IE6 and above).

4. Insecure http resources are loaded into the website, or the certificate is not installed correctly.

When http resources are called in an https page, the IE kernel version of the browser will prompt that the page has unsafe factors. (Firefox and Google also have their own security tips)

5. Use a self-signed SSL certificate.

A self-signed SSL certificate is a certificate issued by an individual or organization themselves. They pose a significant security risk, are more vulnerable to attacks, and are not trusted by browsers.

6. Use certificates with poor generality.

Similarly, using an SSL certificate with poor versatility issued by a small service provider is not trusted by browsers. Because the top layer of the certificate trust chain is the CA organization, and these small service providers lack the credibility of the CA organization and are not trusted by browsers. Therefore, it is recommended to choose a CA organization that has passed the certification of the international Webtrust standard and has the ability to provide international electronic certification services.

7. The SSL certificate does not match the website domain name

One of the necessary verification steps when applying for an SSL certificate is to verify the domain name. An SSL certificate will be issued only after the domain name verification is passed. Therefore, the SSL certificate corresponds to the website domain name one-to-one. The certificate of website A cannot be used for website B, otherwise the browser will also prompt "The SSL certificate is invalid."