How to handle SSL certificate errors? Step-by-step troubleshooting and resolution guide

now that HTTPS encryption has become the standard of websites, SSL certificate errors are a problem that webmasters and ordinary visitors may encounter. Such errors will not only cause the website to fail to access normally, but also make visitors question the security of the website, which will lead to traffic loss and even trust crisis. Many people do not know where to start when encountering SSL certificate errors, and they either try again blindly or do nothing. This article will disassemble the causes of SSL certificate errors from multiple dimensions, and provide a set of systematic troubleshooting and solutions to help you solve such problems efficiently and restore the normal access and security properties of the website.

How to initially troubleshoot SSL certificate errors?

encounter SSL certificate error, the first step can not rush to operate, first through the basic troubleshooting to narrow the scope of the problem, to avoid subsequent useless work.

1, confirm the error prompt specific information

different SSL certificate errors will have different prompt content, such as certificate expired, domain name mismatch, certificate untrusted, etc. Browsers usually mark the specific reason on the error page, webmasters can also use SSL detection tools to obtain detailed error reports, which is the core basis for locating problems.

2, test multi-end point multi-browser access

use different brands of browsers and different devices to access the target website, if only a single device or browser SSL certificate error, the high probability is the end point local problem; if all end points are wrong, then the problem is most likely in the website certificate or server configuration.

Does the SSL certificate error originate from the certificate itself?

SSL the problem of the certificate itself is a common cause of SSL certificate errors, and such problems need to be investigated from the life cycle and attributes of the certificate.

1, check whether the SSL certificate has expired

SSL certificates have a fixed valid period. The valid period of free certificates is usually 3 months to 1 year, and paid certificates can reach 2 years. If the certificate exceeds the valid period, the browser will directly pop up the SSL certificate error prompt. You can check the validity and expiration time of the certificate through the certificate details page of the browser or the SSL detection tool. If it has expired, you need to apply to the certificate authority for renewal or repurchase in time.

2, confirm whether the SSL certificate domain name matches

some SSL certificates only support specific domain names. For example, a single domain name certificate can only be bound to one main domain name. If it is deployed on a subdomain or other domain names, there will be an SSL certificate error with a mismatched domain name. You need to check the list of domain names bound to the certificate. If you want to cover multiple subdomains, you should replace it with a wild-card SSL certificate or a multi-domain SSL certificate.

Is SSL certificate error related to server configuration?

even if there is no problem with the SSL certificate itself, improper server configuration may cause SSL certificate errors, which is a link that webmasters are prone to ignore.

1, check whether the SSL certificate file is fully deployed

deploy SSL certificates, in addition to the master certificate file, you also need to configure the intermediate certificate chain. If only the master certificate is installed and the intermediate certificate is missing, the browser cannot verify the trust chain of the certificate, and an SSL certificate error will pop up. You can check whether the certificate chain is complete through the SSL detection tool. If it is not complete, you need to obtain the intermediate certificate from the certificate authority and supplement the deployment.

2 Confirm server SSL protocol and encryption suite configuration

some old SSL protocols such as SSL2.0 and SSL3.0 have security bugs, which are no longer supported by modern browsers. If the server still enables such protocols, SSL certificate errors will be caused. At the same time, the encryption suite configuration is too old or incompatible will also lead to similar problems. It is recommended to configure the server to support TLS1.2 and above protocols, with mainstream encryption suites.

4. Does the end point local cause an SSL certificate error?

in addition to the problems on the website side, the local settings of the visitor's end point may also cause SSL certificate errors.

1, check the browser certificate trust list

If the website uses a self-signed certificate or a certificate issued by a niche organization, the browser will not add it to the trust list by default, and then the SSL certificate error will pop up. For personal test websites, you can manually import the certificate into the browser's trust list; but for external service websites, it is recommended to replace it with an SSL certificate issued by a regular organization trusted by mainstream browsers.

2, check whether the local system time is synchronized

browser will verify the valid period of the SSL certificate through the local system time. If the local system time deviates too much from the actual time, for example, after the certificate expiration time is set in advance, an SSL certificate error will be triggered. Simply synchronize the system time to network standard time to solve such problems.

sum up, SSL certificate error incentives cover multiple levels of the site end and end point, from the initial investigation to narrow the scope, to check the certificate itself, server configuration, and then to the end point local settings, a system of troubleshooting process can help you quickly locate the problem. Whether it is certificate expiration, improper configuration or abnormal end point settings, as long as the corresponding measures such as renewing the certificate, adjusting the configuration, and synchronizing time are taken, SSL certificate errors can be efficiently solved to ensure safe access to the website and user trust.