This site is not secure message in Edge, IE, Chrome or Firefox

If you see a This site is not secure message in Edge, Internet Explorer, Chrome or Fireofx, with Error Code DLG FLAGS INVALID CA, on your Windows 10 computer then this post will throw some light on it.

This site is not secure

The exact message you will see is:

This site is not secure

This might mean that someone’s trying to fool you or steal any info you send to the server. You should close this site immediately.
Your PC doesn’t trust this website’s security certificate.
The hostname in the website’s security certificate differs from the website you are trying to visit.

The options you have are;

  • Close the tab and not visit the site
  • Go on to the webpage which is not the recommended option.

You could try another thing:

  • Clear your browser cache and try again
  • Check using another browser.

Such Certificate errors usually occur when:

  1. The certificate isn’t installed correctly
  2. The certificate expired and the site hasn’t renewed it
  3. Website is compromised and there is a malicious redirection.

So if you trust the website then you may proceed to visit the site. But if you have doubts or are unsure, best to close the tab and avoid visiting the wabpage.

If you receive this error frequently on your favorite website, you could contact its administrators and ask them to look into this matter.

Administrators may want to check if your network is behind a Proxy. Also check if the Certificates are renewed and they are propogating correctly.

See this post if you receive Your connection is not secure error.

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Anand Khanse is the Admin of, a 10-year Microsoft MVP Awardee in Windows (2006-16) & a Windows Insider MVP. Please read the entire post & the comments first, create a System Restore Point before making any changes to your system & be careful about any 3rd-party offers while installing freeware.