The earliest recollection of this bug is traced back to PAN-OS 10.1.0 - May 06, 2026. This bug is fixed in PAN-OS versions 10.1.5. Firewalls managed by a Panorama management server enter maintenance mode if: Workaround: When downgrading managed firewalls, downgrade to PAN-OS 10.1.5 first and then continue on your downgrade path. When upgrading Panorama, upgrade to PAN-OS 10.1.5 first and then continue on your upgrade path. Fixed an issue where firewalls managed by a Panorama management server entered maintenance mode if: Panorama was running PAN-OS 10.2 and managed firewalls were downgraded from PAN-OS 10.2 to PAN-OS 10.1.4 or earlier PAN-OS release Panorama was upgraded from PAN-OS 10.1 to PAN-OS 10.2 and managed firewalls were running PAN-OS 10.1.4 or earlier PAN-OS 10.1 release. For more information: https://docs.paloaltonetworks.com/pan-os/10-1/pan-os-release-notes/pan-os-10-1-0-known-and-addressed-issues/pan-os-10-1-0-known-issues https://docs.paloaltonetworks.com/pan-os/10-1/pan-os-release-notes/pan-os-10-1-1-known-and-addressed-issues/pan-os-10-1-1-known-issues https://docs.paloaltonetworks.com/pan-os/10-1/pan-os-release-notes/pan-os-10-1-2-known-and-addressed-issues/pan-os-10-1-2-known-issues https://docs.paloaltonetworks.com/pan-os/10-1/pan-os-release-notes/pan-os-10-1-3-known-and-addressed-issues/pan-os-10-1-3-known-issues https://docs.paloaltonetworks.com/pan-os/10-1/pan-os-release-notes/pan-os-10-1-4-known-and-addressed-issues/pan-os-10-1-4-known-issues 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