The CryptoAPI 2.0 Diagnostics is a feature available on Windows Server 2008+ that supports the trouble shooting of issues concerned with, for example:

  • Certificate Chain Validation
  • Certificate Store Operations
  • Signature Verification

This article describes how to enable the CAPI2 Diagnostic, but for an in depth review of the capability, check here

Enable CAPI2 logging by opening the Event Viewer and navigating to the Event Viewer (Local)\Applications and Services Logs\Microsoft\Windows\CAPI2 directory and expand it.  You should see a view named Operational as illustrated in Figure 1.

Figure 1, CAPI2 Diagnostics in Event Viewer

Next, right-click on the Operational view and click the Enable Log menu item as shown in Figure 2.

Figure 2, Enable CAPI2 Event Logging

Once enabled, any warnings or errors are logged into the viewer.  Reproduce the problem you are experiencing and check if the issue is logged.