We have been working with TAC to find the cause of this issue where FTP client could no longer upload to external companies FTP server over the VPN tunnel. After many days, we started a packet filter on the Public Internet (WAN) interface, which is a different zone from the tunnel interface, and were still seeing drops due to "flow_dos_pf_strictip". We had previously disabled the zone_protection policy that was applied to the tunnel interface zone, and even though we did not see drops, the uploads were failing. When we finally did that packet filter on the WAN interface we saw the drops again due to the same reason "flow_dos_pf_strictip" and decided to remove the zone protection policy from the WAN interface. BOOM! FTP uploads succeed. Combing through the policy I saw the strict ip check option and removed it, then pushed the policy overwriting our revert. Everything still good.
We couldn't find the configuration change that put that feature in place (wish that function worked better in the Palo, or just knew how to use it better!) and reading the KB pages for that feature, I'm not sure why it was causing our traffic to be dropped.
Any help would be very much appreciated!
@JohnWiktorski Thanks for the feedback. It look's like they have updated there known issues documentation for PAN OS 9.1.12 now as well with this bug ID.
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