Windows 10: Security certificate

If this question doesn't bleong here move it or delete it.Windows 11 Pro, desktop computer. Computer is wired to AT&T modem. Computer is turned on. Unplug the electricity to AT&T modem to refresh the Internet connection. Plug the modem's electricity back in. A popup window warn about security of device cetificate. I assume that device is the AT&T modem. I do nothing with the popup. Computer indicates no wired Internet connection, only WiFi. The computer is rebooted and on reboot the wired Internet connection is working. Is there anything I should do with the popup?

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security certificate

Hi,

Thank you for posting your query on Microsoft Community.

I would like to know if this issue occur on Different Web browsers too?

I would suggest you to try the following steps, when you access secured website you may get this error message.

1. Open Internet Explorer and verify that the page you are trying to view is listing a certificate error.

2. To clear the certificate error goes to Tools --> Internet Options from the menu of IE 11.

3. Click on the advanced tab and scroll down to the security section. Clear the boxes for: "Check for publisher's certificate revocation" and "Check for server certificate revocation".

4. Click Apply and Ok.

5. Attempt to reload the page by clicking the Refresh button at the end of the address bar or by pressing the F5 key. Your page should now load as expected.

This error can be cause by the SSL certificate of the website – maybe it was not issued by a trusted Certification Authority on the client side. It could even be an attempt to fool you or intercept data you send to the server. Or maybe the certificate has
expired.

I suggest you to refer to the Microsoft help article and check if it helps.

https://support.microsoft.com/en-us/kb/931850

I would suggest you to refer the link below and check if it helps:

Certificate errors: FAQ

Certificate errors: FAQ - Microsoft Support

Hope this information was helpful and do let us know if you need further assistance. We will be glad to assist.

 

Security Certificate Problems with Windows 10

Hi,

Thank you for posting your query in Microsoft Community.

• 
  Where exactly are you getting Security Certificate Warnings?
  
• 
  Are you using Internet Explorer?
  
• 
  Since when are you facing this issue?
  

I suggest you to send us Screen shot of the image (Security Certificate Warnings).

Follow the steps given in the link below to provide the screenshot.

How to include a screenshot in your post

Redirecting

Reply with necessary information and I’ll be happy to help you further.

Thanks and Regards

 

Expired security certificate for Metropcs.com

Hi David,

Getting the error message that says the site is using an invalid security certificate may be caused by missing certificates or could be due to web browser cache issues. To sort out this problem, try manually installing the missing certificates and deleting
the web browser's browsing history. Follow the steps below:

Manually installing the missing certificates.

• In Internet Explorer, click Continue to this website (not recommended), if the error message about having invalid security certificate pops up.
  
• Click the Certificate Error to open the information window.
  
• Click View Certificates, and then Install Certificate.
• On the warning message that appears, click Yes to install the certificates.

Clearing browsing history.

• Launch Internet Explorer.
• Click Tools (gear icon) on the top-right corner, then select
  Internet Options.
• Under General > Browsing history, click Delete.
• Tick the box for Temporary Internet files and website files.
• Click Delete.

Once done, try accessing the website again and see if you still get the same error.

Let us know the result.

Regards.