The earliest recollection of this bug is traced back to PAN-OS 10.1.9 - February 19, 2025. This bug is fixed in PAN-OS versions 10.2.4, 10.1.9. Fixed an issue where the connection to the PAN-DB server failed with following error message: Failed to send req type[3], curl error: Couldn't resolve host name . For more information: https://docs.paloaltonetworks.com/pan-os/10-1/pan-os-release-notes/pan-os-10-1-9-known-and-addressed-issues/pan-os-10-1-9-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-addressed-issues