OK i got it! when i block UDP traffic from LAN see rule (or image below) to the IPcam ipaddress it works as it should. what i think happened is that default UDP doesn't work, still don't know why btw, then the camera is forced to use TCP. Its just a guess.

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@akegec thanks ... no luck so far. I'll see if I can find the post you are referencing.

Nice catch! Thanks for the follow up. 👍