Palo Alto Networks - Defect ID: PAN-128078
Fixed an issue where a process ( mgmtsrvr ) stopped responding and was inaccessible through SSH or HTTPS until the firewall was power cycled.

The earliest recollection of this bug is traced back to PAN-OS 8.1.15 - January 09, 2024. This bug is fixed in PAN-OS versions 8.1.15, 9.1.3. Fixed an issue where a process ( mgmtsrvr ) stopped responding and was inaccessible through SSH or HTTPS until the firewall was power cycled. For more information: https://docs.paloaltonetworks.com/pan-os/8-1/pan-os-release-notes/pan-os-8-1-addressed-issues/pan-os-8-1-15-addressed-issues https://docs.paloaltonetworks.com/pan-os/9-1/pan-os-release-notes/pan-os-9-1-addressed-issues/pan-os-9-1-3-addressed-issues