We're currently having some issues with ms-ds-smb (both v2 and v3) traffic on our PA-3020's (active/passive pair), where we are seeing a 97% speed decrease measured against direct traffic.
In order to determine the source of the issue, I have tried to disable server response inspection and all the security profiles, but I'm still getting speeds around 3-4MB/s. If I create an application override rule for tcp/445 I'm suddenly seeing around 100MB/s.
I don't really expect 100MB/s with threat protection enabled, but 3-4MB/s makes it seem like we're hitting a bug, and the firewall is far from overworked in terms of sessions and dataplane CPU usage.
Have anyone else had issues with SMB on PANOS 8.1? This has been for the last couple of versions, and we're currrently running 8.1.4.