The earliest recollection of this bug is traced back to PAN-OS 8.1.9 - January 09, 2024. This bug is fixed in PAN-OS versions 9.1.12, 8.1.9. ( PA-5200 Series firewalls only ) Fixed an issue where a process ( brdagent ) stopped responding, which caused the management plane to stop responding. For more information: https://docs.paloaltonetworks.com/pan-os/8-1/pan-os-release-notes/pan-os-8-1-addressed-issues/pan-os-8-1-9-addressed-issues https://docs.paloaltonetworks.com/pan-os/9-1/pan-os-release-notes/pan-os-9-1-addressed-issues/pan-os-9-1-12-addressed-issues