Powershell script: pfSense Certificate Viewer
Sometimes it happens in pfSense that certificates are created with duplicated SerialNumbers (in the same CAroot). If any of these certificates are revoked, and it's in use by openVPN, we will be surprised of having more revoked certs than the desired. This tool finds those duplicated SerialNumbers into a non encrypted xml pfSense config backup.
Last change 2019/07/21: New feature: Now it also shows the CRL(s) in which the cert appears.
Thanks to pippin for show me the links to the pfSense docummented issue: