The earliest recollection of this bug is traced back to PAN-OS 10.1.0 - July 22, 2025. ( PA-3200 Series, PA-5220, PA-5250, PA-5260, and PA-7000 Series firewalls ) For traffic between virtual systems (inter-vsys traffic), the firewall cannot perform source NAT using dynamic IP (DIP) address translation. Workaround: Use source NAT with Dynamic IP and Port (DIPP) translation on inter-vsys traffic. 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