Windows 10: Connection not Secure- Error Not Yet Valid Certificate

Hy Guys
I am pulling my hair out trying to fix this problem. I am getting this error for every website that I am trying to open right after the fresh install of Windows 10. I have seen and tested most of the fix but I am totally failing at finding the real problem here. I am using Mozilla and Edge browsers and its happening in both. Below fixes already tried;

1- Time/Date of the System is Correct
2- No antivirus is installed/Disabled Windows Defender as well
3- Restarted router/connection
4- Checked drivers/restarted PC
5- Enabled and Disabled Firewall. Also checked the allow an app on secure/public network.
6- Internet Options -> Lan Settings -> Checked Automatically detect settings


I remember facing the same issue few months back on another office PC and after failing at fixing the issue, I just installed new windows. I will really appreciate help in this regard.

:)

 

Getting Certificate error for Activesync with HTC touch pro2 with win mobile 6.1 "The security certificate on the server is not valid. Contact ….""

Hi

We are using wildcard certificate with reverseproxy and activesync seems to working with all Mobile modesl except HTC touch pro2 with win mobile 6.1. We are getting certificate error "The security certificate on the server is not valid. Contact ….". Please
suggest how to correct this issue



Regards

LMS

 

Receiving error, "Security certificate has expired or is not valid"

Original title:- security certificate

Why would it say the security certificate ha expired or is not valid??

 

Certificate error: "Content is blocked because it is not signed by a valid security certificate" with IE11 and Windows 10.

Hi,

Thank you for posting your query on Microsoft Community.

Appreciate the steps that you have taken so far to fix this issue.

We will assist you to resolve the issue.

• 
  Is the issue confined to any specific website?
  
• 
  Can you let us know few websites with which you are facing this issue?
  
• 
  Did you make any changes to the computer prior to the issue?
  

A site's certificate allows Internet Explorer to establish a secure connection with the site. Certificate errors occur when there's a problem with a certificate or a web server's use of the certificate. Internet Explorer helps keep your information
more secure by warning about certificate errors.

Let us try the following steps, and check if it helps.

Step 1: Let us try to open Internet Explorer in No Add-on mode and check how it works.

If you are able to access the websites, after disabling the Add-ons, try to enable one add-on at a time and check which add-on is causing the issue.

Refer: Manage add-ons in Internet Explorer

http://windows.microsoft.com/en-us/internet-explorer/manage-add-ons#ie=ie-11

Step 2:

a. Start Internet Explorer.

b. On the Tools menu, click Internet Options.

c. Click the Advanced tab, and then locate the Security section.

d. Click to clear the Check for server certificate revocation check box, and then click OK.

e. Restart the computer.

Also, see:

1. How to troubleshoot script errors in Internet Explorer

https://support.microsoft.com/en-us/kb/308260

2. Certificate errors: FAQ

http://windows.microsoft.com/en-US/internet-explorer/certificate-errors-faq#ie=ie-11

Disclaimer: The Reset Internet Explorer Settings feature might reset security settings or privacy settings that you added to the list of Trusted Sites. The Reset Internet Explorer Settings feature might also reset parental control
settings. We recommend that you note these sites before you use the Reset Internet Explorer Settings feature.

Let us know the status, we are glad to assist you further.