The earliest recollection of this bug is traced back to PAN-OS 10.1.10-h5 - November 18, 2024. This bug is fixed in PAN-OS versions 10.2.4-h3, 10.1.11, 10.1.10-h5, 11.0.3. Fixed an issue where, after a high availability failover, IKE SA negotiation failed with the error message INVALID_SPI , which resulted in temporary loss of traffic over some proxy IDs. For more information: https://docs.paloaltonetworks.com/pan-os/10-1/pan-os-release-notes/pan-os-10-1-10-known-and-addressed-issues/pan-os-10-1-10-h5-addressed-issues https://docs.paloaltonetworks.com/pan-os/10-1/pan-os-release-notes/pan-os-10-1-11-known-and-addressed-issues/pan-os-10-1-11-addressed-issues https://docs.paloaltonetworks.com/pan-os/10-2/pan-os-release-notes/pan-os-10-2-4-known-and-addressed-issues/pan-os-10-2-4-h3-addressed-issues https://docs.paloaltonetworks.com/pan-os/11-0/pan-os-release-notes/pan-os-11-0-3-known-and-addressed-issues/pan-os-11-0-3-addressed-issues