Yes, it's exactly as you describe.

Excellent idea with the DNS Tony!! I'm using a PiHole DNS server on a Raspberry Pi, but the DNS of the AIO was still set to 192.168.1.1 (which is the IP of the gateway). I changed it to 192.168.1.105 (= the IP of the PiHole).

Problem immediately fixed! Yay!
Thanks so much! Still wonder why it did work on the laptop though. After all, both computers are connected to the same gateway... crazy
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Riocar 80gig S/N : 010101580 red
Riocar 80gig (010102106) - backup