The earliest recollection of this bug is traced back to PAN-OS 9.1.11 - July 29, 2024. This bug is fixed in PAN-OS versions 9.1.11. Fixed an issue where Panorama was not accessible via the web interface due to insufficient available disk space in the opt/mongobuffer partition , which caused the mongodb process to stop responding. For more information: https://docs.paloaltonetworks.com/pan-os/9-1/pan-os-release-notes/pan-os-9-1-addressed-issues/pan-os-9-1-11-addressed-issues