The earliest recollection of this bug is traced back to PAN-OS 8.1.17 - January 08, 2024. This bug is fixed in PAN-OS versions 9.1.5, 8.1.17. Fixed an issue where, after rebooting the firewall, the SNMP object identifier (OID) for TCP connections per second (panVsysActiveTcpCps / .1.3.6.1.4.1.25461.2.1.2.3.9.1.6.1) returned 0 until another OID was pulled. Additionally, after a restart of a daemon ( snmpd ), if the above OID was called before other OIDs, there was an approximate 10 second delay in populating the data pulled by each OID. For more information: https://docs.paloaltonetworks.com/pan-os/8-1/pan-os-release-notes/pan-os-8-1-addressed-issues/pan-os-8-1-17-addressed-issues https://docs.paloaltonetworks.com/pan-os/9-1/pan-os-release-notes/pan-os-9-1-addressed-issues/pan-os-9-1-5-addressed-issues