The earliest recollection of this bug is traced back to PAN-OS 8.1.6 - July 22, 2025. This bug is fixed in PAN-OS versions 8.1.6. ( WF-500 Appliances only ) Fixed a rare issue that occurred after upgrading from a PAN-OS 8.0 release to a PAN-OS 8.1 release where the disk partition became full due to the amount of data on the drive and, when you tried to delete the backup database to free up space, the debug wildfire reset backup-database-for-old-samples CLI command failed and resulted in the following error: Server error : Client wf_devsrvr not ready. For more information: https://docs.paloaltonetworks.com/pan-os/8-1/pan-os-release-notes/pan-os-8-1-addressed-issues/pan-os-8-1-6-addressed-issues