How much was it?
pfSense doesn't play nicely with RealTek NIC's which is what comes bundled in the majority of small chassis "firewall" PC's on Amazon.
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I actually have an Intel NUC at home, I could get a USB to NIC dongle and try it out?
It's being used to run OpenPHT at the moment but I have a Pi I could put in its place while I test.