If you use Google Chrome, try navigating to a specific website and seeing the error message that your connection is not private when you enter the website’s address in the URL bar and press Enter. You are affected by a problem NET:: ERR_CERT_COMMON_NAME_INVALID. If you click the Advanced Show under the error message that says your connection is not private, you’ll see the problem code NET:: ERR_CERT_COMMON_NAME_INVALID.


Google Chrome displays this error message to the user when it asks for the website credentials in question and receives incorrect or unusual credentials for the site. In most cases, the error message triggered by the website’s SSL certificate being visited doesn’t match the Google Chrome certificate recorded for that particular website. Since visiting a website with unsuccessful information can be dangerous, Google Chrome will display this error message and advise affected users to access the site at some point to take any threat. Any security threats can be disabled at the bottom of the website.

How to fix

As stated, this issue only occurs on websites that use the HTTPS protocol instead of the HTTP protocol and encrypts all data exchange between them and the user’s computer. Most people don’t know that for every website that uses the HTTPS protocol, a version of the website uses the HTTP protocol for various reasons. You can easily bypass this problem by replacing “HTTP” in the address of the website you are trying to access with “HTTP,” which will take you to the website’s unencrypted version and use the interface.

However, be careful in doing so; you will reduce your computer protection by visiting an unencrypted website, which is why you should consider trying to resolve the issue. This when the website you are trying to access is a well-known and trusted website (e.g., Facebook or YouTube).

Method 1: Disable (or uninstall) all third-party security programs

Third-party security programs have also been identified as the cause of this issue in many cases. If you have any third-party anti-virus programs, anti-malware software, or firewalls installed and actively running on your computer, disabling them (or removing them completely) may help your computer get rid of this problem. However, if the problem persists after you have disabled or uninstalled all such programs, switch to a different solution.

Method 2: Clear the DNS resolver cache contents on your computer

  1. If you are using Windows 7, open the Start Menu, search for ” cmd “, right-click on the search result titled cmd, and click on Run as administrator. If you are using Windows 8, 8.1, or 10, press the Windows logo key + X to open the WinX Menu, and click Command Prompt (Admin) in the WinX Menu. If you can’t find CMD through WinX Menu, use Windows 7’s instructions, and they should work fine.
  2. Type in elevated command Command Prompt and press Enter :

Ipconfig / flushdns

  1. Once the command has been executed, close the upgraded Command Prompt.
  2. Restart the computer and check to see if the problem has been fixed after booting up.

Method 3: Use Google’s DNS server

If your computer is configured to use random DNS servers automatically, the servers it uses may explain why you are experiencing this problem. If that’s the case, you need to configure your computer to use Google’s DNS servers instead of having to work. To do so, you need to:

  1. Right-click the Network icon in your computer’s notification area and click Open Network and Sharing Center in the resulting context menu.
  2. Click on Change adapter settings in the left pane.
  3. Right-click on your internet connection and click on Properties.
  4. Click Internet Protocol Version 4 (TCP / IPv4) to select it and click Properties.
  5. Enable Use the following DNS server addresses:
  6. Set the Preferred DNS server to 8.8.8. 8
  7. Set Alternate DNS server to 8.8.4 . 4
  8. Click on OK, and then on OK again, and close Network and Sharing Center.
  9. Restart your computer.

When the computer boots up, try to access the website you are having difficulty reaching first and see if you have gotten rid of the error message NET:: ERR_CERT_COMMON_NAME_INVALID.

Solution 4: Edit the computer’s host file to fix the problem

  1. Press Windows Logo + E key to launch File Explorer.
  2. Navigate to the following directory:

X: Windows System32 drivers etc

Note: Replace the X in the directory above with the letter that corresponds to the partition of your computer’s hard drive that Windows is installed on (for most folks, it’s disk C ).

  1. Locate and right-click on a file named hosts and click Open.
  2. From the list of programs you are provided with, click and select Notepad, and click OK. Doing so will open the host’s file in Notepad, where you can easily edit it.
  3. Browse the host’s file, and if you find any of them containing website address you can’t access, delete them.
  4. Press Ctrl + S to save the changes you made, and then close the hosts
  5. Close File Explorer and restart your computer.

When the computer boots up, try to go to a website that you could not have before and check if the problem is fixed.