It happened to me recently too on my UM3. When I changed filament from generic filament, back to UM filament with a RFID. Apparently Cura and my UM3 decided there was a misconfiguration, so Cura Connect halted any further network printing until until the misconfiguration was rectified. The misconfiguration can be overridden on the Cura Connect screen.
Of course it may have been an UM3 communication issue too, I have been getting a few of those lately.
BTW, I don't believe Cura Connect print management is very helpful if there is just one user of an UM3, it seems to get in the way more than it helps.
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kmanstudios 1,120
If you are using cura connect, then try to use the cura connect reset on the machine. If you do not have print cores installed in both slots it will not work no matter what you do. One may have gotten loose(?) or maybe it just needs a reset to see proper configuration.
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