The earliest recollection of this bug is traced back to PAN-OS 10.2.0 - July 15, 2026. This bug is fixed in PAN-OS versions 10.2.1. Fixed an issue where, after a successful upgrade to PAN-OS 10.2, logging into the firewall or Panorama web interface from the same internet browser window or session from which the firewall or Panorama was upgraded did not work. After successful upgrade to PAN-OS 10.2, logging in to the firewall or Panorama web interface from the same Internet browser window or session from which the firewall or Panorama was upgraded displays the following error: Your login session has expired and you have been logged out for security reasons. Please log in again if you wish to continue. Workaround: The following are different ways to log in to the firewall or Panorama web interface after upgrading to PAN-OS 10.2. For more information: https://docs.paloaltonetworks.com/pan-os/10-2/pan-os-release-notes/pan-os-10-2-0-known-and-addressed-issues/pan-os-10-2-0-known-issues https://docs.paloaltonetworks.com/pan-os/10-2/pan-os-release-notes/pan-os-10-2-1-known-and-addressed-issues/pan-os-10-2-1-addressed-issues