The earliest recollection of this bug is traced back to PAN-OS 8.1.12 - January 09, 2024. This bug is fixed in PAN-OS versions 8.1.12. Fixed an issue where you were unable to establish an SSH session through a CLI command using a Diffie-Hellman (DH) algorithm. For more information: https://docs.paloaltonetworks.com/pan-os/8-1/pan-os-release-notes/pan-os-8-1-addressed-issues/pan-os-8-1-12-addressed-issues