Lately my Mac cannot connect to any scanners. I get this error message every time I open the system scan tool on any of the connected scanners:
Failed to open a connection to the device (-21345)
I've tried removing all scanners and re-installing.
I've tried doing "reset print system" on each connected device and then rebooting my system.
I've tried buying a brand new scanner (HP Deskjet 2755e in this case) but that new scanner has the same issue.
Tried updating to Mac OS 11.6 Big Sur.
This is the 2nd Mac I've had that is affected by this and so far the only thing that has ever (temporarily) fixed it is wiping the entire thing and reinstalling my system. I shouldn't have to do this every time I get this error.
All the scanners are connected over Bonjour AirPrint.
How do I fix this?