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Delete local CRL cache in Windows

Windows automatically caches retrieved CRLs and OCSP reponses. The advantage is that it speeds up revocation checking and uses less network bandwidth. The disadvantage is that clients will not detect new CRLs until the local cache expires. Normally you should Continue reading


Manually remove old CA references in Active Directory

Summary When a CA server is uninstalled or crashes beyond recovery some objects are left in Active Directory. It’s good practice to remove these obsolete objects. Background When you install a version of Certificate Authority that is Active Directory-integrated (i.e. Continue reading


Delete certificates on smart cards

If you want to delete existing certificates on a smart card, follow these steps: Start PowerShell (or cmd, since we do not actually use PS-commands) Insert the smart card in a reader Run the command certutil -scinfo Enter PIN if Continue reading


Which Root CAs do you really trust?

When I ask people which Root CAs they trust, they usually show me the list in Trusted Root Certification Authorities. Like this one, from a freshly installed Windows Server 2012: But that is actually not the entire truth. If I Continue reading


Problem with Windows Update?

To remain secure and prevent new attack vectors it it important to keep you Windows installation up to date. If you encounter problems when trying to use Windows Update, such as error 80070003, 80248007 or 80072ee2, try downloading and running Continue reading