Net::err_cert_common_name_invalid: What to do Now?


Net::err_cert_common_name_invalid:

To make the site look authentic and safe for the users to use for hours and hours, especially if required to make any monetary transaction, enrolling for HTTPS(hypertext transfer protocol secure) is highly important.

But sometimes, if a proper secure sockets layer (SSL) certificate isn’t correctly installed on the website, then there are high chances of this error- Net::err_cert_common_name_invalid. 

In the following article, the concept of getting rid of Net::err_cert_common_name_invalid is explained with the step-by-step approach to ensure that if you’re stuck on the issue, you come out within less possible time. Don’t forget to read the article until the end to get an exciting hack. 

Solving Net::err_cert_common_name_invalid error immediately could be a tricky task, probably because of different reasons cited by the web browser.

To get an SSL certificate, remember, the more the conditions, the more complexity involved in the task, and of course, more time and effort is required. And the opposite is also true, but what causes this error?

What causes Net::err_cert_common_name_invalid error to occur?

To understand the error, understand the term ‘Common name.’ An alternative name given domain name on the SSL certificate, which is similar to the web address in the host, is referred to as a common name.

For instance, to secure the website with an SSL certificate from mysite.com, the common name should be mysite.com. 

The appearance of the Net::err_cert_common_name_invalid error means the common name and domain name are not identical. And there could be a variety of other messages too flashing on your screen, just like:

  • Proxy settings are misconfigured.
  • SSL certificate does not account for www or non-www variations of your domain.
  • Antivirus software is blocking your SSL connection
  • The browser extension is interfering with your site’s SSL connection.

There are many other ways too, but the standard, occurring messages are above.

Different Validations of Web Browsers And How To Fix?

Before fixing the error, identify your browser and the nature of the Net::err_cert_common_name_invalid error.

Google Chrome:

The warning of “Your connection is not private” is a threat to the potential users to switch onto the HTTP screen. Most of the time, landing on the page without any security turns away many prospective visitors. 

Fix:

Open the site in an incognito screen to find out if a browser extension is a cause for NET::ERR_CERT_COMMON_NAME_INVALID error. 

This will mitigate all installed extensions. If you can access the site in incognito mode without problems, then a browser extension may cause the problem. 

The best solution, in this case, is to disable the extensions one by one to see which extension is causing the error. Then you can eliminate the cause to fix the problem permanently.

Mozilla Firefox:

A warning sign with potential security risks ahead indicates that your connection is not secured. It means to refrain from accessing the website because it is not configured correctly.

Fix:

Suppose the domain name doesn’t match the name on the certificate, then the error increases. The easiest way to determine is to compare the certificate “issued to” domain information to the domain where the certificate is installed. 

A subject alternative name, or SAN certificate, refers to a certificate that spans a domain other than the domain specified by the common name.

For example: 

Common name: Mysite.com

SAN could be like: mail.mysite.com, mysite.com, www.mysite.org

A wildcard certificate protects all subdomains at a given level of a common name domain.

Common names in wildcard certificates use asterisks to indicate unlimited levels and follow the format *.mysite.com. WildCard for *.mysite.com includes all subdomains of that level (blog.mysite.com, mail.mysite.com, live.mysite.com, etc.).

However, you should also check the list of SANs within the certificate (or ensure that the domain where the certificate is installed matches the wildcard scope). Some of the commons examples are:

  • GeoTrust QuickSSL Premium Wildcard 
  • Thawte SSL123 Wildcard 
  • Thawte Wildcard SSL
  • GeoTrust True BusinessID Multi-Domain Wildcard 
  • GeoTrust Wildcard SSL 

Safari

“Safari can’t open the page” is another way of stating the standard name error and somewhere more vague than other browsers. 

Fix:

If everything is correct in your certificate configuration, but you’re still getting the NET::ERR_CERT_COMMON_NAME_INVALID error, it means you need to authenticate the SSL state. Browser’s cache uses up loading for SSL certificates even though you uploaded them now. 

Suppose using Windows system then, open Start menu searches for Internet Options. Please select it to go to the Content tab, and click on the Clear SSL Slate button.

To clear SSL status on macOS, use Keychain Manager. Go to Settings > Privacy & Security > Manage Certificates > Delete the required one.

Enter your password. 

Removing the certificate is to clear the SSL state and resolve the NET::ERR_CERT_COMMON_NAME_INVALID (if the cache is corrupted). 

Additionally:

Clear your browser cache by going onto Settings >choosing More Tools > Clear Browsing History.

Note: 

You can also specify which data to delete by visiting your privacy and security settings. Don’t forget to select Cached Images and Files from the list of options.

Internet Explorer

Ensuring the site is not secure and to gain trustworthiness, an SSL certificate has few other specifications. Sometimes, offering the user its solution underbuy (like removing www from the domain) appears temporary. 

Fix:

A proxy server is designed to route web traffic to remain anonymous to the client or origin server. If proxy settings are not configured correctly, Internet access can be restricted, and various problems can occur, including SSL errors. 

Attempt to reset proxy settings to avoid this problem. 

Try to access your proxy settings by going to Settings > Advanced > System > “Open your computer’s proxy settings.” It can work on any OS.

On Windows, the Internet Properties window will open. Choose Connections tab> the LAN Settings button >select Automatically detect settings: 

The Network Settings window > Proxy tab on macOS and select “Automatic proxy settings.”

Try the process till the issue is resolved. 

Hack:

An outdated OS may cause errors when trying to access certain websites. For this reason, it’s a good idea to make sure you’re running the latest version of Windows, macOS, or Linux. 

You also need to make sure your browser is up to date. To do this, open the “Settings” menu in Chrome and select “Help”> “About Google Chrome. “

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