An update is available that enables administrators to ...
Untrusted root certificates (certificates that are publicly known to be fraudulent) can be distributed by using the following method: Clients can download or update untrusted root certificates by using the auto update mechanism. The list of untrusted roots certificates is stored in a CTL (untrusted CTL) on Windows update servers.

How to export Root Certification Authority Certificate
ip_address = Root Certification Authority Server IP. fqdn = Fully qualified domain name of the Root Certification Authority Server. b. Click the "Download a CA certificate, certificate chain, or CRL" link. c. Press on "Download CA certificate" link. d. Save the file "certnew.cer" in local disk store.

October 3, 2019—KB4524157 (Monthly Rollup)
To help secure your devices, we recommend that you install this update as soon as a possible and restart your PC to fully apply the mitigations. Like all rollup updates, this update supersedes any preceding update. Note This update does not replace the upcoming October 2019 monthly update, which is scheduled to release on October 8, 2019.

XP Root Certificate update/version problem - Microsoft ...
Latest XP Root Certificate update is dated 9-4-2011 (downloaded directly from Microsoft)... That Created date reflects when you downloaded it, not the date the Root Certificates update itself was issued/created. Install the one offered at Windows Update (in Optional Software updates category in the left menu).
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Outlook 2019 Security Alert for a "Certificate ...
Installing the certificate won't help. Your company will need to update the certificate or change how it publishes the autodiscover entry for the corporate domain. Additionally see; Autodiscover: Some quick methods to get it working
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January 14, 2020—KB4534310 (Monthly Rollup)
IMPORTANT Starting on January 15, 2020, a full-screen notification will appear that describes the risk of continuing to use Windows 7 Service Pack 1 after it reaches end of support on January 14, 2020. The notification will remain on the screen until you interact with it. This notification will only appear on the following editions of Windows 7 Service Pack 1:

Known issue for security update 3136000 for the .NET ...
To directly download the Microsoft Certificate Authority 2011 certificate, go to Microsoft Root Certificate Authority 2011. Thumbprint: 8f 43 28 8a d2 72 f3 10 3b 6f b1 42 84 85 ea 30 14 c0 bc fe Method 4: System administrators and customers can use the UI provided by the certmgr.msc MMC snap-in to add certificates to the trusted root store.

windowsupdate security certificate - Microsoft Community
We suggest that you run the Windows Update troubleshooter. This tool automatically diagnose and repair common problems with Windows Update. If that didn't do the trick, proceed to method 2. Method 2: Manually Reset Windows Update Components. The issue might also occur due to corruption in Windows Update component files.
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Certificate validation fails when a certificate has ...
Additionally, if the Turn off Automatic Root Certificates Update Group Policy setting is disabled or not configured on the server, the certificate from the certification path that you do not want to use may be enabled or installed when the next chain building occurs. To change the Group Policy setting, follow these steps:

Installation blocked by administrator - Microsoft Community
Ensure to install any pending updates on the computer and remember to restart the computer. Keep us informed to help you further. 19 people were helped by this reply
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