Disclaimer

Known affected versions were inferred from fixed-version data and were not explicitly confirmed by the vendor: 8.1.19, 9.1.8

The earliest recollection of this bug is traced back to PAN-OS 8.1.20 - July 22, 2025. This bug is fixed in PAN-OS versions 9.1.9, 8.1.20. Fixed an issue with firewalls in an HA configuration where multiple all_pktproc processes stopped responding due to missing heartbeats, which caused service outages. Fixed an issue with firewalls in a high availability configuration where multiple all_pktproc processes stopped responding due to missing heartbeats, which caused service outages. For more information: https://docs.paloaltonetworks.com/pan-os/8-1/pan-os-release-notes/pan-os-8-1-addressed-issues/pan-os-8-1-20-addressed-issues https://docs.paloaltonetworks.com/pan-os/9-1/pan-os-release-notes/pan-os-9-1-addressed-issues/pan-os-9-1-9-addressed-issues