Disclaimer

Known affected versions were inferred from fixed-version data and were not explicitly confirmed by the vendor: 8.1.9-h4, 9.1.3-h1

The earliest recollection of this bug is traced back to PAN-OS 8.1.10 - July 22, 2025. This bug is fixed in PAN-OS versions 8.1.10, 9.1.4. Fixed an issue where the firewall did not detect user credentials when the number of users exceeded 60,000. To leverage this fix, you must upgrade Windows agents to User-ID agent or a later User-ID agent release. Fixed an issue where the firewall did not detect user credentials when the number of users exceeded 60,000. To leverage this fix, you must upgrade Windows agents to User-ID agent 8.1.11 or a later User-ID agent 8.1 release. For more information: https://docs.paloaltonetworks.com/pan-os/8-1/pan-os-release-notes/pan-os-8-1-addressed-issues/pan-os-8-1-10-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