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"Failed to open a connection to the device (-21345)"

cc3
New Contributor

Running Big Sur on Mac Pro.  Out of the blue, printer works fine (AirPrint mode), but when attempting to now scan, I receive the message:  "Failed to open a connection to the device (-21345).  Printer is recognized as default printer in Printers and Scanners and no errors appear.  I cannot find anything online about this error now appearing. (Firewall is disabled as well.) Printer/Scanner is a TR 7020.

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