However, if you are 100% sure that the error is a mistake, you should not hesitate and learn how to fix the DLG_FLAGS_SEC_CERT_CN_INVALID error. WARNING: The website you visiting might be maliciousīefore proceeding to the methods that can fix “This site is not secure” error, we want to warn that your browser might actually prevent you from malicious content.Ĭhrome users should especially pay attention to this error message because this browser is designed to stop users from accessing websites that might be used for phishing or other cyber crimes.

Expired or missing the trusted root certificate for the Certification Authority (CA).

Issues with website’s security certificate.

There are three main reasons why this security error might show up on your browsers: However, the attack on a particular site might not be a problem. Indeed, it’s always recommended to stay away from the sites that are marked as unsafe. Thus, the fear of getting infected with the dangerous virus often discourages from clicking “Go on to the website (Not Recommended)” button.

In the era of malware, it’s possible that popular site was hacked. When website delivers a “This site is not secure” error, the majority of users believe that something went wrong with the website. This security error might bother every Internet user. However, if you are an older OS user, you should not be surprised to see the error code DLG_FLAGS_SEC_CERT_CN_INVALID too. The issue is most likely to bother Windows 10 users. The error has been reported on Google Chrome, Mozilla Firefox, Microsoft Edge, Internet Explorer and Opera web browsers. The example of 'This site is not secure' error. However, the problem is that this error message might show up when users try to access legit and safe sites that they were visiting on a daily basis. The major web browsers, such as Google Chrome or Mozilla Firefox, stop and warn users when they are about to enter a potentially harmful website. In the technical language, this error is known under the name of DLG_FLAGS_SEC_CERT_CN_INVALID. “This site is not secure” is a security alert that prevents users from accessing various websites.

3 What to do if nothing helped to fix “This site is not secure DLG_FLAGS_SEC_CERT_CN_INVALID” error?.

Turn off “Warn about certificate address mismatch” feature

2 Methods to fix “This site is not secure” pop-up (error code DLG_FLAGS_SEC_CERT_CN_INVALID).

1.1 WARNING: The website you visiting might be malicious.

Connection not secure firefox fix