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

cc3
Apprentice

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.

5 REPLIES 5

bryanhiggs
Apprentice

I, too, have this problem. I am on an iMac, running macOS Monterey, Version 12.2.1

My printer/scanner is a Maxify GX7020, and I have only just installed it. It prints fine.

But when I try to "Open Scanner" from the OS System Preferences "Printers & Scanners", it brings up a window that initially says "Waiting for scanner...", but then, after some time, says "Failed to open a connection to the device (-21345)"

I also tried using the Canon IJ Scan Utility Lite app, and click on the "Refresh Scanner Information". It already has a Canon G7000 series entry for another Canon printer we have, but it does not find the GX7020.

Please help! It would be nice to be able to use this scanner.

Thanks!

I note that, when I try to do the same thing with the Canon G7000 series printer/scanner, it produces the same error.

Hi bryanhiggs,

Disabling IPv6 on your MAXIFY GX7020 will resolve the scanning error (-21345) that you are experiencing.  To do this, please follow the steps in this article:

https://support.usa.canon.com/kb/index?page=content&id=ART180168

 

 

 

 

Did this answer your question? Please click the Accept as Solution button so that others may find the answer as well.

Thank you! It did!

But why? I would have thought that, following a standard setup, the printer should be able to handle scanning by default? Are there plans to fix this?

Patrick
Product Expert
Product Expert

Hi cc3,

Disabling IPv6 on your PIXMA TR7020 will resolve this issue.  To do this, please follow the steps in this article:

https://support.usa.canon.com/kb/index?page=content&id=ART180164

 

 

 

Did this answer your question? Please click the Accept as Solution button so that others may find the answer as well.
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