How to Fix SSL Certificate Error in FireFox/Chrome? - MiniTool

SSL certificate error: FAQs and solutions for Windows 10/11 browser

SSL certificate errors are common failures during browser use. This article will explore its causes and provide practical methods to solve this problem in Windows 10/11 systems.

Causes of SSL certificate errors

SSL certificates are used to verify the identity of the website and protect sensitive information such as account names and passwords by encrypting data transmission between the server and the client. When the browser cannot verify the SSL certificate returned by the server, an SSL certificate error occurs. The browser will issue a warning that the website is untrusted and block access. Common SSL certificate errors include client server errors, SSL certificates are not trusted, invalid server certificate errors, and SSL certificate mismatch errors. There are many causes of SSL certificate errors, and we will provide corresponding solutions for different reasons.

Solution to the Chrome/Firefox browser SSL certificate error

Method 1: Update SSL certificate

Certificate expiration is the most common cause of SSL certificate errors, because each certificate has a validity period and the browser will reject expired certificates. If your SSL certificate expires or the browser system time is incorrect, updating the SSL certificate of the web server to the valid latest certificate is an effective workaround.

Method 2: Check whether the SSL certificate contains all website domain names

To avoid accidental attacks, the browser checks whether it communicates with the correct server. If the website's domain name is missing in the certificate, the browser will assume that it is communicating with the wrong server, thus blocking the connection and denying the certificate.

When an SSL certificate error occurs in this case, you should make sure that the certificate contains the domain names of all websites and overwrite all subdomains with wildcard certificates, or overwrite multiple host names with SAN certificates.

Method 3: Turn off the SSL warning (risk warning: This method has security risks, please operate with caution!)

This method is very dangerous because it will prevent you from receiving any warnings or error messages when visiting any untrusted website. If you are very sure of your actions, you can follow these steps:

For Google Chrome:

Step 1. Open your Google Chrome browser, enter chrome://flags in the address bar and press Enter.

Step 2. Locate the Allow invalid certificates for resources loaded from localhost option and enable it.

For Mozilla Firefox:

Step 1. Open the browser, enter about:config in the address bar and press Enter to open the advanced configuration.

Step 2. Click to accept the risk and continue .

Step 3. In the next screen, find browser.ssl_override_behavior and change its value from default 2 to 1 .

Method 4: Add the certificate to the browser's trusted storage area

You should always make sure to purchase certificates from a reliable certificate authority. If you use an untrusted certificate, your browser will not be able to find the root certificate in the local trusted certificate store.

Method 5: Obtain a new certificate

The certificate authority will revoke the certificate before the certificate expires, so you should avoid any leaf certificate or intermediate certificate in your browser being revoked. It is recommended to use OCSP (Online Certificate Status Protocol) to check the certificate status.

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