Same issue here. I was wanting to utilise VLAN's and firewall it off along with my PoE Camera's.
It does seem to be by design , contacted support did not get anywhere and sent screenshots of it connecting to Amazon - I was told to connect it to the internet to fix my issue... great.
It's a shame as apart from this issue the Camera is brilliant.

Latest posts made by JKB96
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RE: Argus 2 not working without Internet access