How to Fix Error DLG_FLAGS_SEC_CERT_CN_INVALID?

6 Effective Methods to Fix the DLG_FLAGS_SEC_CERT_CN_INVALID Error

Web browsers like Microsoft Edge, Internet Explorer, Google Chrome, and Mozilla Firefox have become our virtual gateways to explore the vast online domain. However, occasionally, these browsers encounter specific security issues that prevent us from accessing websites smoothly. The “DLG_FLAGS_SEC_CERT_CN_INVALID” error, specifically affecting Windows 11 and Windows 10 users, is one such hurdle that demands attention and resolution, as encountering this error while browsing the web can be frustrating.

Therefore, we will help you understand what the dlg_flags_invalid_ca error exactly means and provide you with actionable steps carefully crafted to address this error. You will be guided through the necessary troubleshooting techniques to regain access to the websites you need in no time.

What is a DLG_FLAGS_SEC_CERT_CN_INVALID Error?

The DLG_FLAGS_SEC_CERT_CN_INVALID error denotes that there is a certificate-related issue that’s affecting the connection between the web browser and the website. The error refers explicitly to a mismatch between the common name (CN) listed on the SSL certificate and the domain name the user is trying to access.

Why Does the DLG_FLAGS_SEC_CERT_CN_INVALID Error Occur?

The DLG_FLAGS_SEC_CERT_CN_INVALID error can also occur due to several other reasons, such as:

• Incorrectly Configured SSL Certificate: This error can occur if the SSL certificate installed on the web server does not have a common name (CN) or subject alternative name (SAN) that matches the domain name being accessed. For example, if a certificate is issued for “dlg_flags.local.domain,” but the user tries to access the website using just “dlg_flags/,” the mismatch triggers the error.
• Expired or Invalid Certificate: If the certificate presented by the website has expired or is considered invalid by the browser, the DLG_FLAGS_SEC_CERT_CN_INVALID error can occur. This situation typically requires renewing the website’s certificate to resolve the error.
• Incomplete Chain of Trust: This error may occur when the web server does not have all the necessary intermediate certificates installed to establish a complete chain of trust. Ensuring that the server has a proper certificate chain can help resolve this issue.

Note: These are some likely causes, and troubleshooting strategies may differ depending on the specific circumstances and specifications.

How to Resolve the DLG_FLAGS_SEC_CERT_CN_INVALID Error?

You can fix the issue effectively by trying out the methods provided below. Feel free to explore each method & proceed to the next one if the previously used method does not yield the desired results.

• Clear the Browser’s Cache
• Install Missing Certificates
• Disable the Warn about certificate address mismatch option.
• Check the System’s Date & Time.
• Use a Different SSL Certificate
• Reset the Browser

We are confident that at least one of these methods (mentioned above) will successfully resolve the “DLG_FLAGS_SEC_CERT_CN_INVALID” error, ensuring a smooth browsing experience.

Clear the Browser’s Cache

Clearing the browser’s cache is essential to resolving various web-related issues, particularly this one. It is so because cached data, including outdated or conflicting certificates, can interfere with secure connections.

Follow the steps given below to clear the browser’s cache:

• Open a fresh tab in the browser (Google Chrome).
• Click on the three vertical dots (Customize and control Google Chrome).
• From the list, select More Tools, and click Clear browsing data.
• In the Clear browsing data dialog box, select the range from the Time range list, and click Clear data.

Install Missing Certificates

Sometimes, the error occurs due to missing intermediate or root certificates necessary for establishing a secure connection. You can manually install the missing certificates on your system to address this.

Follow the steps given below to install the missing certificates:

• Click on Continue to this website (not recommended) option placed on the error page.
• Select the Certificate Error option next to the red Address Bar;
• On the information window, click View Certificates.
• Select Install Certificate and follow the instructions displayed on the screen.
• In the dialog box, click Yes.

Disable the Warn About Certificate Address Mismatch Option

Disabling the warning about the certificate address mismatch option can be a temporary solution, but exercise caution as it may compromise your browsing security.

Follow the steps given below to disable the warning about the certificate address mismatch option:

• Click on the Search button placed on the taskbar.
• Type Internet Options and press Enter.
• Navigate to the Advanced tab.
• Under the Security section, uncheck the checkbox present in front of the Warn about certificate address mismatch option.
• Clip Apply and then click OK to save the changes.

Check the System’s Date & Time

Incorrect system date and time settings can lead to certificate validation errors. Hence, ensure that your computer’s date and time are accurately set.

Follow the steps given below to check the system’s date & time:

• Click on the Search button.
• Type Set the time zone automatically and press Enter.
• Click on the toggle button placed on the right of the Set time automatically option.
• Click on the toggle button placed on the right of the Set time zone automatically option.

Use a Different SSL Certificate

If you are a website administrator experiencing the error, obtaining and installing a new SSL cert with the correct common name or SAN might be necessary. Contact your Certificate Authority to request a new certificate that precisely matches the domain name being accessed. Follow the CA’s instructions for certificate installation, and once the new certificate is installed, restart the server and verify if the error is resolved.

Reset the Browser

If the above methods do not resolve the DLG_FLAGS_SEC_CERT_CN_INVALID error, resetting the browser to its default settings can help. Resetting the browser removes any conflicting settings, extensions, or configurations that may be causing the error.

Follow the steps given below to reset the browser:

• Open a fresh tab in the browser (Google Chrome).
• Click on the three vertical dots (Customize and control Google Chrome).
• From the list, select Settings.
• In the Settings window, click Reset Settings.
• Click Restore settings to their original defaults.
• Click Reset settings.

Conclusion

In conclusion, encountering the “DLG_FLAGS_SEC_CERT_CN_INVALID” error can be a frustrating experience when trying to access websites through popular web browsers like Microsoft Edge, Internet Explorer, Google Chrome, and Mozilla Firefox on Windows 11 or Windows 10. This error signifies a certificate-related issue caused by a mismatch between CN and the domain name being accessed, along with various other reasons.

Several actionable methods can be used to overcome this error and regain seamless browsing capabilities. These methods include clearing the browser’s cache to eliminate conflicting data, installing any missing certificates crucial for secure connections, temporarily disabling the “Warn about certificate address mismatch” option, verifying the system’s date and time accuracy, considering the utilization of a different SSL certificate if necessary, and ultimately resetting the browser to its default settings to eradicate any underlying conflicts or configurations causing the error.

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