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This updater expands on the existing automatic root update mechanism technology that is found in Windows Vista and in Windows 7 to let certificates that are compromised or are untrusted in some way be specifically flagged as untrusted. A certificate trust list CTL is a predefined list of items that are signed by a trusted entity. All the items in the list are authenticated and approved by a trusted signing entity.
This update expands on this existing functionality by adding known untrusted certificates to the untrusted certificate store by using a CTL that contains either their public key or their signature hash. After this update is installed, customers benefit from quick automatic updates of untrusted certificates.
Users who have disconnected systems will not benefit from this feature improvement. These customers will still have to install the root certificate updates when they are made available.
Please see the "More Information" section. This could cause problems for enterprises that hardcode these URLs in their firewalls as exceptions. The following are the new URLs:. Users who have disconnected systems can install this update. But those users do not receive a benefit from the update. In fact, installing this update may cause service startup failures immediately after the server is restarted. Services that perform certificate validation tasks during service startup may experience an increased delay while network retrieval of the trusted and untrusted CTLs from Windows Update is tried.
For systems that are running Windows Vista, Windows 7, Windows Server , or Windows Server R2 and that are using the automatic updater of untrusted certificates that is, if either KB or KB is already installed , see the rest of this section and also Microsoft Knowledge Base article for more information. Customers do not have to take any action because these systems will be automatically protected.
If the system does not have access to Windows Update, either because the system is not connected to the Internet or because Windows Update is blocked by firewall rules, the network retrieval will time-out before the service can continue its startup procedure. In some cases, this network retrieval time-out may exceed the service startup time-out of 30 seconds.
If a service cannot report that startup has completed after 30 seconds, the service control manager SCM stops the service. If you cannot avoid installing this update on disconnected systems, you can disable the network retrieval of the trusted and untrusted CTLs.
To do this, you disable automatic root updates by using Group Policy settings. To disable automatic root updates by using policy settings, follow these steps:. In the details pane, double-click Certificate Path Validation Settings.
Click the Network Retrieval tab, select Define these policy settings , and then clear the Automatically update certificates in the Microsoft Root Certificate Program recommended check box. After you make this change, automatic root updates are disabled on those systems to which the policy is applied. We recommend that the policy be applied only to those systems that do not have Internet access or that are prevented from accessing Windows Update because of firewall rules.
If automatic root updates are disabled, Administrators must manually manage root certificates that are trusted by Windows. Trusted root certificates can be distributed to computers that are running Windows by using Group Policy. For more information about how to manage the root certificates that are trusted by Windows, visit the following Microsoft website:.
Certificate Trust Verification Certificate Trust List Overview For more information about the Windows root certificate program, click the following article number to view the article in the Microsoft Knowledge Base:. Download the Windows6. Release Date: June 12, For more information about how to download Microsoft support files, click the following article number to view the article in the Microsoft Knowledge Base:.
Microsoft used the most current virus-detection software that was available on the date that the file was posted. The file is stored on security-enhanced servers that help prevent any unauthorized changes to the file. For a list of the files that are provided in this update, download the file information for this update Need more help?
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