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Common problems HP Solution Center not working : Adobe Flash Player Error and Unable to scan
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marsmith
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Officejet Pro 8500 A910 accessed via Mac/Big Sur"failed to open a connection to the device (-21345)"

HP Recommended
Officejet Pro 8500 A910
macOS 11.0 Big Sur

When I attempt to access the scanner, "failed to open a connection to the device (-21345)" is returned. The strange thing is that this worked before, i.e., I recently configured a new driver after upgrading to macOS 11.X (Big Sur), and it worked. But it doesn't work now. Nothing has changed since my successful operation. I tried deleting the driver and then selecting again--that didn't work. 

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TEJ1602
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@marsmith, Welcome to HP Support Community!

 

Ensure that the printer is up to date with its firmware and Mac is up to date with its software. If you are unsure you may use the links below to update the printer firmware and Mac software:

Update printer firmware

Update software on Mac 

 

Also, try to wake up the printer before trying to scan.

 

To be able to assist you better, I'd like to know the following-

  • How is the printer connected to the computer?
  • Are you able to print from the computer?
  • Are you able to make photocopies on the printer?

Keep me posted for further assistance.

TEJ1602
I am an HP Employee

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