Regarding the camera issue only: the ability to see the camera (over LAN - unrelated to DF) went away briefly a few weeks ago with version 8.1.1 and I think it's back in 8.1.2. So check the firmware version on the printer and if you have 8.1.1 then upgrade to 8.1.2. If you have 7.X, I'd leave it as is for now until you get DF figured out.
Hi, sorry to hear your having issues with Digital Factory.
But as you are having network related issues I would recommend contacting UltiMaker Support directly.
UltiMaker does not provide official support via community posts.
Additionally if you would like to try and troubleshoot the issue yourself the following article might be helpful.
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