On the command line I am able to nc <devid>.agent.particle.io 5683 and it does connect and spew some encrypted data as I would expect (likely asking for a handshake). I think this whole issue has something to do with the build toolchain or “system firmware” for Pi; the firmware itself doesn’t seem to be resolving DNS. My guess (not knowing too much about the cloud claiming system) is that the device needs to be reachable by the cloud before it can be claimed… and if the firmware isn’t connecting, then it can’t contact the “device” (firmware) and thus cannot “claim” it… correct me if I’m wrong.