Yap! You are right... Some times we don’t think as it should be. It’s exactly the same situation that I’ve with the printer – just an IP assign and everything is working.
As far as I know, TrueNAS (before FreeNAS) has not any internal firewall. At least configurable with the GUI. I’ll investigate deeper.
Maybe it’s the gateway (I’ve some doubts that is wrong), so I’ve to confirm.
For testing, I’ll also change the NAS to the LAN (same net where I’ve also the pfSense) and check if anything changes.