Disclaimer

Known affected versions were inferred from fixed-version data and were not explicitly confirmed by the vendor: 8.1.19, 9.1.10, 10.1.4-h6

The earliest recollection of this bug is traced back to PAN-OS 10.1.5 - July 22, 2025. This bug is fixed in PAN-OS versions 9.1.11, 10.1.5, 8.1.20. Fixed an issue in an HA active/active configuration where traffic with complete packets showed up as incomplete and were disconnected due to a non-session owner device closing the session prematurely. Fixed an issue on firewalls in HA active/active configurations where traffic with complete packets showed up as incomplete and was disconnected due to a non-session owner closing the session prematurely. Fixed an issue in active/active high availability (HA) configuration where traffic with complete packets was showing up as incomplete and being disconnected due to a non-session owner device closing the session prematurely. For more information: https://docs.paloaltonetworks.com/pan-os/10-1/pan-os-release-notes/pan-os-10-1-5-known-and-addressed-issues/pan-os-10-1-5-addressed-issues 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-9-1-11-addressed-issues