The earliest recollection of this bug is traced back to PAN-OS 11.1.2 - March 18, 2025. The PA-450R, PA-450R-5G, and PA-455 firewalls can experience an interruption of traffic when switching the combo port connection from fiber to copper. Workaround: With the copper port connected, initiate a soft reboot of the firewall using the CLI command request restart system . After the reboot, the copper port will be able to process traffic. For more information: https://docs.paloaltonetworks.com/pan-os/11-1/pan-os-release-notes/pan-os-11-1-2-known-and-addressed-issues/pan-os-11-1-2-known-issues