How to Fix Error Code: DLG_FLAGS_INVALID_CA

Internet users have no idea about the origin or reason for the error code DLG_FLAGS_INVALID_CA. There are multiple reasons for this error. However, the primary reasons include issues with installation of web certificate, expiry of web certificate, lack of renewal by the administrator or the website you are visiting is less secure or has malicious content. In any of these scenarios, the error DLG_FLAGS_INVALID_CA serves as a failsafe to prevent malicious content coming from coming on to your computer.


In most cases, there is an option available to Proceed to the website (not recommended). Consequently, if this option is not available there are solutions mentioned below.

Open Website in Different Browser

The first step that you should do after receiving this error is to open the website in another browser. However, if the website loads in another browser try the step below. If the website still does not load in another browser then the error is within your system. Then, try the remaining options below.

Clear Browser Cache

Sometimes, the cache in the browsers can cause problems with the certificates installed. The solution in this case is to clear the cache of the browser where the website is causing the issue. Subsequently, it may be viable to clear the cache of all installed browsers, just to be on the safe side. We will be handling Microsoft Edge and Google Chrome in this solution.

For Google Chrome

  1. First, paste the URL chrome://settings/clearBrowserData in the address bar.
  2. Then, make sure the Cached images and files option is selected.
    Click on Clear data
  3. Moreover, you can set the range depending on the time since the last update or when the issue started.
  4. Lastly, click on Clear data.

For Microsoft Edge

  1. First, paste the URL edge://settings/privacy in the address bar.
  2. Under Clear Browsing Data, click on Choose what to clear.
    Clear Browsing Data
  3. Then, make sure the Cached images and files option is checked.
    Click on Clear now
  4. Moreover, you can set the range depending on the time since the last update or when the issue started.
  5. Lastly, click on Clear now.

Check if System Time and Date is Synchronized

The biggest reason for invalid certificate error is system date and time is not synchronized. Although, this may seem a minor problem, certificates rely on system time and date. If they are not synchronized, the certificates perceive the system as being outdated. To make sure system time and date are synchronized

  1. First, right-click on Windows 10 taskbar where the time is located.
  2. Then, click on Adjust date/time.
    Adjust date and time
  3. If Set time automatically is not enabled then be sure to enable it.
    Enable Set time automatically and sync time
  4. Then, check under Synchronize your clock when the last sync was.
  5. If the last sync was some time ago click Sync.

Moreover, make sure you have selected the correct time zone.

Change Internet Options

Although, you may not have faced this issue before, as stated above, updates for either the browser or for Windows can cause issues with internet certificates. Moreover, there is also a chance for Windows updates to cause changes in some system settings. However, this solution is more of a workaround than a solution. This solution is recommended only if you have an anti-virus installed. To change the internet options of your computer

  1. First, press the Windows key and type Internet Options.
    Type Internet Options
  2. Then navigate to the Advanced tab.
    Internet Properties Advanced tab
  3. Scroll down in Settings.
  4. Then, under Security deselect the option Warn about certificate address mismatch*.
    Certificate Address mismatch
  5. Finally, restart your computer.
  6. Hopefully, your issue will have been resolved.

Kevin Arrows

Kevin Arrows is a highly experienced and knowledgeable technology specialist with over a decade of industry experience. He holds a Microsoft Certified Technology Specialist (MCTS) certification and has a deep passion for staying up-to-date on the latest tech developments. Kevin has written extensively on a wide range of tech-related topics, showcasing his expertise and knowledge in areas such as software development, cybersecurity, and cloud computing. His contributions to the tech field have been widely recognized and respected by his peers, and he is highly regarded for his ability to explain complex technical concepts in a clear and concise manner.