Disclaimer

Known affected versions were inferred from fixed-version data and were not explicitly confirmed by the vendor: 8.1.15-h3, 9.1.3-h1

The earliest recollection of this bug is traced back to PAN-OS 8.1.16 - July 22, 2025. This bug is fixed in PAN-OS versions 8.1.16, 9.1.4. Fixed an issue for S11 traffic where if the Modify Bearer Request message came after 30 seconds of Create Session Response message, the firewall dropped the Modify Bearer Request packet. This fix increases this time to 90 seconds. For more information: https://docs.paloaltonetworks.com/pan-os/8-1/pan-os-release-notes/pan-os-8-1-addressed-issues/pan-os-8-1-16-addressed-issues https://docs.paloaltonetworks.com/pan-os/9-1/pan-os-release-notes/pan-os-9-1-addressed-issues/pan-os-9-1-4-addressed-issues