DLG_FLAGS_INVALID_CA Windows 10 Error Code (Solved)

When you visit a web page or the home page of a website, instead of loading the page, you get an error that says This site is not secure – Error code: DLG_FLAGS_INVALID_CA DLG_FLAGS_SEC_CERT_CN_INVALID on Windows 10 on Microsoft Edge, Internet Explorer 11, Google Chrome or Mozilla Firefox. Here are some simple explanations of the error and what you can do to get rid of it.


To fix the problem, you will first need to know what this error is about. Whenever you see This site is not a safe error, regardless of the error code you receive, it implies that there is a problem with the website’s certificate if the website is running HTTPS.

If you’re particularly getting the DLG_FLAGS_INVALID_CA DLG_FLAGS_SEC_CERT_CN_INVALID error code in Windows 10, it could mean a few things.

  • The website certificate cannot be recognized by your browser.
  • The website certificate has expired or is not installed correctly.
  • The website uses HTTPS without a proper certificate installed and is intended to be secure.

So the error you see basically indicates that there is a problem with the website certificate. The certificate of a website is controlled by the administrator or the owner of the website. So you can’t really do anything about it if the error is in the website certificate.

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This error often occurs when a website administrator forgets to renew their certificate, so this site is not a safe error code DLG_FLAGS_INVALID_CA DLG_FLAGS_SEC_CERT_CN_INVALID to your readers every time an HTTPS page is requested.

What are the options available?

When you see the “This site is not secure” error, particularly the DLG_FLAGS_INVALID_CA error code, you will generally see the following two options.

Get back to safety or go to link of the homepage which will redirect you to the previous web page or to the default home page of your browser. This is usually the recommended option to avoid problems visiting sites that can be malicious if the certificate is incorrect.

Clicking Advanced, later Continue to this website or Continue anyway, the link will ignore the warning and continue to load the web page regardless of its unrecognizable certificate. This is not recommended on websites that cannot be trusted.

However, there can also be some situations where the website certificate is legitimate and works fine, but you still get the error. If that’s the case, especially if you’re getting the same error on every website you try to visit, or you’re visiting a few websites that you’re sure can be trusted, here’s what you can do to fix the problem.

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Check the date and time

Setting the date and time incorrectly is one of the most common reasons for SSL and certificate error when you visit any HTTPS website. This is because when your browser tries to read the certificate to decide if it would be safe to visit the secure page, it will first check its date to see if it matches your local date and time. If it doesn’t, it will show a certificate error like This site is not a safe error code DLG_FLAGS_INVALID_CA DLG_FLAGS_SEC_CERT_CN_INVALID error.

To check your date and time, in Windows 10, click the date and time on your taskbar. Please select Set date / time . Activate the option set time automatically to allow Windows to synchronize its time with the Microsoft server to obtain the most accurate time.

Clear your browser’s cache

Another reason why the DLG_FLAGS_INVALID_CA Windows 10 error code could occur is when your browser tries to load a cached version of the web page instead of reloading the updated version of it when there have been changes.

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Try clearing your browser’s cache and see if it fixes the DLG_FLAGS_INVALID_CA DLG_FLAGS_SEC_CERT_CN_INVALID in Microsoft Edge, Internet Explorer, Google Chrome or Mozilla Firefox.

The steps to clear browser caches vary from browser to browser. The option is usually found on the page Setting or Choices from your browser. For example, in Microsoft Edge, go to Setting , later choose what to delete . As for Firefox, click Choices , later clear cookies and cache .

After clearing the browser cache, try again to visit the problem website again.

Try using another web browser

If the problem occurs in Edge, try using other browsers like Chrome or Firefox. The problem can sometimes be with your default web browser. The causes can be add-ons or extensions that you have installed, incorrectly configured browser settings, faulty proxy settings, or outdated browser.

If the website loads correctly in another browser, you may want to reset your problematic browser to its default value to try to fix the error code This site is not safe DLG_FLAGS_INVALID_CA DLG_FLAGS_SEC_CERT_CN_INVALID on Windows 10.

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