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ERR_CERT_COMMON_NAME_INVALID is a very popular SSL error during loading the website. In most cases, the issue is due to certificate misconfiguration on a server. However, it may appear due to antivirus and firewall or another third-party extensions and software. Check the example of the error on the screenshot below.
Fixing the NET::ERR_CERT_COMMON_NAME_INVALID error is not very difficult, but would takes some time and extra steps. You have to start by identifying the cause of mismatch error first.
Your Chrome browser will show ERR_CERT_COMMON_NAME_INVALID error in case the date and time are wrong on your computer or mobile device. Please recheck and adjust it on your via PC settings.
In some cases, the problematic browser extension could be a reason for the error. First of all, try to open the website in Incognito window and if that solves the issue then no need to check extensions. Otherwise, follow the next steps:
In most cases the issue comes from wrong SSL installed, it may simply not support the correct domain name or sub-domain. That makes a real mismatch result. For example, you issued and installed SSL for www.domain.tld, but installed it for sub.domain.tld which is not protected. You can check that with your browser.
In Chrome, you have to click to the "Not Secure" button located on the left side of the address bar, and then click to "Certificate". There you will see the details of SSL certificate using the field "issued to". The feature is available in most browsers.
You can also check that using Online SSL test by SSL Labs, that will be a more accurate result.
Make sure Self-Signed SSL is not in use, as they are used for internal server purposes only.
All Single Domain SSL certificates we sell protect WWW and non-WWW version of your domain name. However, there are some certs that do not protect it by default. In that case, you may have a problem using redirection from WWW to non-WWW or opposite option.
The possible solution is to install a proper SSL certificate or remove any redirect and install Multi-Domain, or Wildcard SSL or even multiple single-domain SSL to protect all domains/sub-domains in use.
A very popular issue is forgetting to purchase an SSL certificate. WordPress owners enable secures HTTPS protocol for their website without installing or buying SSL, as result they get NET::ERR_CERT_COMMON_NAME_INVALID error message in the browser. There are two possible solutions in that case:
The browser's SSL cache can be an issue. You have to try clearing the cache to resolve the error.
You may have limited browsing experience if Automatical detection of settings is not set via proxy setup. The solution is a Right-click on the Network Access icon to see Internet Properties. Tap on the "Connection" tab and then to "LAN Settings".
You will see a new window where you have to click to checkbox near the "Automatically detect settings" if it is not checked already. Once done, you can retry opening the website to see if error was solved.
The classical idea is to make sure your OS and Browser is Up to Date as old or outdated software may bring unexpected issues. The developers are working hard to create new patches and bug fixes, so that is critical to have an updated system.
We suggest checking Firewall and Antivirus settings and LOG files to be sure they are not blocking the website you are trying to visit. Review the blocking reason carefully, if you found a block, as probably they are trying to secure you from a malicious website. We do not suggest switching off Antivirus.
You can clearly see that there are multiple possible issues that may bring you to error FIX ERR_CERT_COMMON_NAME_INVALID. However, it is known error and there are quite easy steps to fix the issue. Check data/time of your PC, browser extensions, try to clean SSL cache, recheck Proxy settings and update OS with Browser to latest versions. That should definitely help. Good luck!
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