how to fix Browser Error Code dlg_flags_invalid_ca dlg_flags_sec_cert_cn_invalid

This video tutorial is about "how to fix Browser Error Code dlg_flags_invalid_ca dlg_flags_sec_cert_cn_invalid.

“This site is not secure” is an error message that might pop up when browsing the web with Microsoft Edge, Google Chrome or Mozilla Firefox browsers. It seems that the error mostly bothers Windows 10 users. However, reports about this issue are reported by older OS versions users.

“This site is not secure” error in a technical language is named as DLG_FLAGS_INVALID_CA or DLG_FLAGS_SEC_CERT_CN_INVALID. It occurs when people are trying to open certain websites. If the safety of blocked website is questionable, we would strongly recommend you to avoid visiting it.
There are several reasons why this error might show up, such as:

1. Browser’s cache-related problems.

2. Problems with website’s security certificate.

3. Missing he trusted root certificate for the Certification Authority (CA) on the site.


“This site is not secure” pop-up or DLG_FLAGS_SEC_CERT_CN_INVALID error is related to browser’s cache, cleaning it and resetting browser’s settings should help. However, usually, the culprit of the issue is related to the website‘s security certificate, which has either been installed incorrectly or has expired.

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