failed to open a connection to the device (-21345) error message when trying to scan with HP photosmart c4180

Sorry you have to have this bad experience, Harry. Very often when an operating system is either updated or upgraded, it is necessary to download compliant printer drivers. Normally that should quickly solve the problem. Try it and let us know what results. It is up to the printer manufacturers to provide compatible drivers, not Apple. They do not have access to the printer's software, let alone be able to deal with the thousands of various model printers out there.

Suddenly I'm unable to scan from my MacBook Pro Catalina 10.15.7 getting the message ; "failed to open a connection to the device (-21345) error message when trying to scan"

My printer always worked very well HP PhotoSmart B110 Series

Pls help, I really need the scan function

Thank you

Dear Apple,

Same here! Epson 1660 scanner worked well until upgrade. Now with Big Sur 11.0.1 I get message: Failed to open a connection to the device (-21345)

Sorry, new software, now issues! That will prevent people to update next time.

Please solve!!

Thanks

Harry

You have double posted the same issue on the forum.

I had the same problem with my Epson Perfection V600.

I've not seen a reply so here is the way I overcame the problem:

• open System Preferences.
• click on Printers & Scanners - it just showed my printers
• click on '+' to add a device and select my scanner
• select the scanner in the list of printers and scanners.
• click on 'Open Scanner' to start the scanner and scan a document.