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The earliest recollection of this bug is traced back to PAN-OS 8.1.9 - July 22, 2025. This bug is fixed in PAN-OS versions 8.1.9. Fixed an issue where after you changed the filter configuration in the user.src notin 'cns\proxy full profile the firewall displayed the following error message: Unknown user group cns\Proxy Full . 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
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