The earliest recollection of this bug is traced back to PAN-OS 8.1.7 - July 22, 2025. This bug is fixed in PAN-OS versions 8.1.7. Fixed an issue where the GlobalProtect Gateway host information profile (HIP) notification operation failed to execute and returned the following message: GP-EX-GW-21 -> hip-notification - > win-fw-is-not-enable -> not-match-message -> message is invalid . For more information: https://docs.paloaltonetworks.com/pan-os/8-1/pan-os-release-notes/pan-os-8-1-addressed-issues/pan-os-8-1-7-addressed-issues