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BugZero updated this defect 288 days ago.
The earliest recollection of this bug is traced back to PAN-OS 8.1.16 - January 09, 2024. This bug is fixed in PAN-OS versions 8.1.16. Fixed an issue where the TCP timestamp was stripped from the Client Hello when SSL Forward Proxy decryption was enabled. For more information: https://docs.paloaltonetworks.com/pan-os/8-1/pan-os-release-notes/pan-os-8-1-addressed-issues/pan-os-8-1-16-addressed-issues